AMENDED OPINION
Appellants Roy Lee Pierce and James Evans were convicted in the district court on drug trafficking charges arising from a conspiracy to ship cocaine from Los Ange-les, California for distribution in Tyler, Texas. A jury found Pierce guilty of conspiring to distribute cocaine in violation of 21 U.S.C. § 846 and possessing cocaine with intent to distribute in violation of 21 U.S.C. § 841(a)(1). Evans pled guilty to a conspiracy charge during trial. Both Pierce and Evans raise numerous challenges to their convictions and sentences. Finding no merit in his contentions, we affirm Pierce’s conviction and sentence. Having determined that Evans’s guilty plea was accepted in violation of Rule 11, we reverse his conviction.
I.
BACKGROUND
On December 12, 1987, Angela Evans, James Evans’s wife and Pierce’s sister-in-law, attempted to ship a Christmas-wrapped package from Los Angeles to Tyler via American Airlines. Mrs. Evans first arrived at the American Airlines terminal to pick up a package that had been sent to her from Tyler. After obtaining this package, she left briefly and returned with the package she intended to send. She presented the package to American employee James McAdam, who inquired about its contents. Mrs. Evans replied that the package contained an iron. After Mrs. Evans left, McAdam became suspicious because he believed the package was not heavy enough to be an iron. In an effort to identify the contents, McAdam x-rayed the package. The x-ray revealed not an iron, but an opaque mass. McAdam alerted his supervisor, Eloise Ferguson, and pursuant to airline policy they opened the package. Inside was a large quantity of rock cocaine.
DEA agents arrived shortly after the package was opened. They conducted a field test which identified the substance as cocaine. A small portion was removed and sent for further testing at the Los Angeles County Sheriff’s Department, then a controlled delivery was made by forwarding the package to its intended destination.
After setting up surveillance at the Tyler airport, agents observed Pierce drive up in *673 a vehicle with Hazel Crumpton, to whom the package was addressed. While Pierce waited in the car, Crumpton went into the terminal and picked up the package. She was arrested as she attempted to leave. Pierce made a futile attempt to escape in his car, but his path was blocked by a DEA vehicle. Meanwhile, James and Angela Evans were arrested by officers executing a warrant to search their Los Angeles apartment.
Pierce and James Evans were indicted with their two co-defendants in January, 1988. Crumpton and Angela Evans pled guilty and testified on behalf of the government. After one aborted attempt to plead guilty, James Evans eventually changed his plea to guilty during trial. The jury subsequently found Pierce guilty on both the conspiracy and possession counts. The district court, applying the sentencing guidelines, sentenced Pierce to 262 months in prison and a three year term of supervised release. Evans was sentenced to 360 months in prison and an eight year term of supervised release. Pierce and Evans now bring this appeal, challenging the validity of their convictions and sentences. We address each in turn.
II.
ANALYSIS
A. PIERCE
1. Motion to Suppress
Before trial Pierce moved to suppress the evidence obtained when the package was searched at the American Airlines terminal in Los Angeles, on the grounds that the warrantless search violated his Fourth Amendment rights. After an evi-dentiary hearing the court denied the motion, ruling that there was no Fourth Amendment violation because the initial search was conducted by a private party. In reviewing a district court’s ruling on a motion to suppress based on live testimony at a suppression hearing, we must accept the district court’s factual findings as true unless they are clearly erroneous.
United States v. Fernandez,
Pierce first argues that the court’s finding that the package was initially searched by airline employees is clearly erroneous. He contends that the package was actually opened by the DEA. This contention is meritless. The sole basis for Pierce’s argument is the so-called “tell-tale affidavit” of Agent Paul Black, which indicates that the DEA did open the package first. However, Agent Black testified at the suppression hearing that he subsequently learned that his affidavit was based on second-hand reports which were either incorrect or misinterpreted. On the other hand, the court’s finding is amply supported by the evidence. Airline employees and DEA agents unanimously testified that the package was opened by Ferguson and Me Adam. The court’s finding is not clearly erroneous.
Pierce next alleges that the airline employees were acting as instruments or agents of the government when they opened the package. Pierce is correct in asserting that the Fourth Amendment can be violated by a search conducted by a private party acting as an agent or instrument of the government.
See Coolidge v. New Hampshire,
*674
Pierce is unable to satisfy the second prong of the
Walther
test. Following the suppression hearing the district court dictated its findings and conclusions into the record. The court first found that American Airlines, like other airlines, has a “valid reasonable policy” of exercising caution with and opening suspicious packages. The court further found that McAdam and Ferguson had opened the package pursuant to that policy. Both of these findings are supported by the evidence. There is no evidence that the package was opened at the direction, or even the suggestion, of the DEA. We conclude that the airline employees opened the package to further the airline’s own ends, not solely to assist law enforcement officers.
See United States v. Koenig,
Once it is established that airline employees, acting privately, opened the package, this case is governed by
United States v. Jacobsen,
Applying Jacobsen to the present case, we conclude that neither the initial search by airline employees, nor the subsequent search by DEA, nor the chemical field test violated Pierce’s Fourth Amendment rights. Accordingly, the district court did not err in denying Pierce’s motion to suppress. 2
2. Jencks Act
Angela Evans was interviewed before trial by Assistant U.S. Attorney Ronald Sievert, who took notes during their conversation. At trial, after Evans testified on behalf of the government, Pierce moved for production of these notes under the Jencks Act. He now alleges that the failure of the government to turn over Evans’s pretrial “statement” violates the Jencks Act. We disagree. The Jencks Act provides that upon a defendant’s motion the court shall:
*675 order the United States to produce any statement (as hereinafter defined) of the witness in the possession of the United States which relates to the subject matter as to which the witness has testified.
18 U.S.C. § 3500(b) (emphasis added). Pierce was not entitled to view Sievert’s notes because they do not constitute a “statement” of the witness.
The Jencks Act defines a statement as:
(1) a written statement made by said witness and signed or otherwise adopted or approved by him;
(2) a stenographic, mechanical, electrical, or other recording, or a transcription thereof, which is a substantially verbatim recital of an oral statement made by said witness and recorded contemporaneously with the making of such statement....
18 U.S.C. § 3500(e). This court has previously held that an agent’s interview notes are not “statements” of the witness under § 3500(e) unless the witness “signed or otherwise adopted or approved the report,” 18 U.S.C. § 3500(e)(1), or the notes were “substantially verbatim reports” of the witness interview, 18 U.S.C. § 3500(e)(2).
United States v. Welch,
Pierce further argues that the district court erred by not conducting an
in camera
inspection of the notes to determine whether they qualify as Jencks material. The district court has a duty to inspect documents
in camera
if a timely request is made by the defense
and
some indication exists in the record that the notes meet the Jencks Act’s definition of a statement.
United States v. Hogan,
3. Sufficiency of Evidence
Pierce contends that the evidence is insufficient to sustain his conviction for possession with intent to distribute because he never had possession of the cocaine. In evaluating such a claim we examine the evidence and all reasonable inferences that may be drawn from it in the light most favorable to the jury verdict.
U.S. v. Lindell,
4. Variance
Pierce claims that there is a fatal variance between the allegations in the indictment and the government’s proof at trial. The indictment, he points out, charges him with possessing and conspiring to distribute “cocaine”, while the evidence shows that the substance involved was “cocaine base”. Pierce is not entitled to relief on this ground. Cocaine base is merely an isomer of cocaine. Therefore we doubt that a variance exists at all. However, even if we assume there is a variance, it would not be fatal. In order for a variance to require reversal it must “affect the substantial rights of the accused either (1) by insufficiently informing him of the charges against him such that he is taken by surprise and prevented from presenting a proper defense, or (2) by affording him insufficient protection against reprosecution for the same offense.”
United States v. Sheikh,
5. Sentencing Guidelines
a. Pierce’s Role in the Offense
Pierce contends that the district court erred by increasing his base offense level because of his role in the offense. Section 3Bl.l(b) of the Sentencing Guidelines directs the sentencing court to increase the offense level by three “[i]f the defendant was a manager or supervisor (but not an organizer or leader) and the criminal activity involved five or more participants or was otherwise extensive.... ” We find no error in the court’s application of § 3Bl.l(b).
The district court’s determination that Pierce was a manager or supervisor is a finding of fact reviewable under the clearly erroneous standard.
U.S. v. Mejia-Orosco,
Likewise, the court’s determination that the activity was “otherwise extensive” is not clearly erroneous. 3 Pierce was involved in a conspiracy to ship cocaine halfway across the country for distribution. Hazel Crumpton and Angela Evans both testified about previous shipments made pursuant to the conspiracy, at least some *677 of which were larger than the one seized at the Tyler airport. There was also testimony concerning additional persons whose services were indispensable to commission of the offense. For example, Angela Evans named at least two suppliers in California from whom she obtained cocaine to be shipped to Tyler, and Hazel Crumpton testified that a man named “Geno” had accompanied James Evans on at least one trip to Tyler. 4 We conclude that the district court could properly have found that Pierce was a manager or supervisor of criminal activity that was “otherwise extensive.” Accordingly, Pierce is not entitled to relief on this ground.
b. Obstruction of Justice
§ 3C1.1 of the sentencing guidelines provides that the court is to increase the offense level by two:
If the defendant willfully impeded or obstructed or attempted to impede or obstruct the administration of justice during the investigation or prosecution of the instant offense....
U.S.S.G. § 3C1.1. Pierce contends that the court erred by increasing his offense level under this section. We disagree.
The court’s finding that Pierce obstructed justice is reviewed under the clearly erroneous standard.
United States v. Franco-Torres,
c. Base Offense Level
Pierce next contends that the district court erred by calculating his base offense level as if the offense involved more than 500 grams of cocaine base. He correctly points out that the cocaine in the package seized at the Tyler airport weighed only 493 grams. However, Pierce’s argument is nullified by the commentary to Section 2D 1.4 of the Sentencing Guidelines. Section 2D1.4 sets out the general rule that in calculating the base offense level for a defendant convicted of conspiracy, the offense level shall be the same as if the object of the conspiracy had been completed. Application Note 1 to the section provides that:
*678 If the defendant is convicted of a conspiracy that includes transactions in controlled substances in addition to those that are the subject of substantive counts of conviction, each conspiracy transaction shall be included with those of the substantive counts of conviction to determine scale.
U.S.S.G. § 2D1.4, comment (n. 1) Co-conspirator Hazel Crumpton testified that previous shipments had been made pursuant to the conspiracy, and that these other shipments were generally larger than the one intercepted on December 12, 1987. The district court properly sentenced Pierce according to the total amount of all the shipments involved in the conspiracy without being limited to the amount seized at the Tyler airport or alleged in the indictment.
See United States v. Sarasti,
The district court’s findings about the quantity of drugs to be used in setting the base offense level are factual findings protected by the clearly erroneous rule.
United States v. Thomas,
d. Downward Departure
Pierce alleges that the district court erred in failing to depart downward from the sentence mandated by the guidelines. We will uphold a district court’s failure to depart from the guidelines unless the refusal was in violation of law.
United States v. Buenrostro,
e. Unequal Sentences
Pierce’s final contention is that he was treated differently by the sentencing judge than co-defendant Hazel Crumpton was. This argument provides no grounds for relief. Pierce does not argue that his sentence exceeded that mandated by the sentencing guidelines, and we have already determined that the court correctly applied the sentencing guidelines. Under such circumstances, a defendant cannot base a challenge to his sentence "solely on the lesser sentence given by the district court to his co-defendant.”
United States v. Boyd,
B. EVANS
Evans challenges his conviction and sentence on several grounds. Among these he contends that his guilty plea was taken in violation of Rule 11, Fed.R. Crim.P., because the district court failed to inform him of the possible maximum and mandatory minimum penalty provided by law for his offense. Because we have determined that Evans’s conviction must be reversed on this ground, we limit our analysis to this issue.
Rule 11 requires that before accepting a guilty plea the district court shall address the defendant in open court and inform him of, and determine that he understands “the mandatory minimum penalty provided by law, if any, and the maximum possible penalty provided by law....” Fed.R.Crim.P. 11(c)(1). The government concedes that the district court wholly failed to comply with this provision. The government argues, however, that the court’s failure was harmless error because *679 the indictment informed Evans of the minimum and maximum penalties. We disagree.
Rule 11(h), the harmless error provision of Rule 11, provides that “[a]ny variance from the procedures required by this rule which does not affect substantial rights shall be disregarded.” However, we have previously held that a complete failure of the district court to address one or more of the core requirements of Rule 11 ordinarily requires reversal and will not be treated as harmless error.
United States v. Dayton,
III.
CONCLUSION
Having found no error with regard to Pierce, we affirm both his sentence and conviction. However, since Evans’s guilty plea was accepted in violation of Rule 11, we must reverse his conviction and remand to the district court to permit Evans to plead anew.
The judgment of the district court is, therefore AFFIRMED as to Pierce. As to Evans the judgment is REVERSED and REMANDED for further proceedings.
Notes
. Pierce argues that agents in this case exceeded the scope of the permissible field test because after they identified the substance in the field they took a small sample and sent it for further analysis. Pierce relies on
United States v. Mulder,
. The government also contends on appeal that Pierce lacks standing to challenge the search at the Los Angeles airport. Since we have determined that there has been no Fourth Amendment violation, we need not consider the government's contention.
. We agree with Pierce that his offense did not involve "five or more participants.” Application Note 1 to § 3B1.1 defines a participant as a person who is criminally responsible for the commission of the offense, and the evidence indicates that there were only four "participants” in the offense at issue in this case.
. The government also argues that innocent persons whose services are unwittingly used may be considered in determining whether an organization is "otherwise extensive.” Application Note 2 to § 3B1.1 provides that, in construing the term "otherwise extensive,” "all persons involved during the course of the entire offense are to be considered. Thus, a fraud that involved only three participants but used the unknowing services of many outsiders could be considered extensive.”
See also United States v. Mejia-Orosco,
