On Jаnuary 22, 1998, defendant-appellant Ramon Dueño pleaded guilty to each count of a three-count indictment charging him with being a felon in possession of a firearm, see 18 U.S.C. § 922(g); possessing an unregistered firearm, see 26 U.S.C. §§ 5861(d) & 5871; and transferring a firearm without having met the requirements of 26 U.S.C. § 5812, see 26 U.S.C. §§ 5861(e), 5871, and 5812. The charges to which Dueño pleaded arose from his March 14, 1997 sale of a sawed-off shotgun to an undercover police officer. At the time of the sale, Dueño had a number of prior criminal convictions, including a 1991 Massachusetts conviction for assault and battery, and a 1994 Massachusetts conviction following a guilty plea to a charged violation of a statute proscribing, “in the night time, break[ingj and entering] a building, ship, vessel, or vehicle, with intent to commit a felony.” Mass. Gen. Lаws Ann. ch. 266, § 16.
At sentencing, both sides agreed that the 1991 assault and battery conviction is a “crime of violence” within the meaning of the career offender provisions of the federal sentencing guidelines.
See
U.S.S.G. § 4B1.2. But they disagreed as to whether the 1994 breаking and entering conviction should be so regarded. The dispute mattered because the charges to which Dueño pleaded in this case trigger the more draconian sentencing provisions of the career offender guideline,
see United States v. Fortes,
The breаking and entering statute under which Dueño pleaded guilty encompasses conduct that constitutes a crime of violence (i.e., breaking into and entering a person’s home,
see
U.S.S.G. § 4B1.2(a)(2) (“burglary of a dwelling” is a crime of violence)), and conduсt that almost certainly does not (i.e., breaking into and entering a vehicle,
see infra
at 6-7 (rejecting the government’s suggestion that we affirm by ruling that all of the conduct described by the statute is violent);
cf. United States v. Harris,
apprоpriate for the sentencing court to look to the conduct in respect to which the defendant was charged and pled guilty, not because the court may properly be interested (in this context) in the violent or non-violent nature of that particular conduct, but because that conduct may indicate that the defendant and the government both believed that the generically violent crime ... rather than the generically non-violent crime ... was at issue.
Harris,
In this case, the government successfully argued at sentencing that, notwithstanding the generic nature of the breaking and entering charge set forth in the 1994 state court complaint, a fair reading of the complaint as a whole establishes that Dueño brokе into and entered a building, and thus committed a crime of violence. The government based its argument on a second charge in the same complaint, which apparently alleged that Dueño “willingly and maliciously destroy[ed] or injurfed] the рersonal property, dwelling, house or building of [the victim], the value of the property so destroyed or injured exceeding two hundred and fifty dollars, in violation of [Mass. Gen. Laws Ann. ch. 266, § 127].” The government now correctly concedes that its prior argument, and the district court’s acceptance of the argument, are not sustainable; even if it could be in *6 ferred that both charges in the complaint arose from essentially the same course of criminal conduct, the comрlaint can as readily be taken to describe an unlawful entry into a vehicle, followed by vandalism in the vehicle causing more than $250 worth of damage, as it can be taken to describe a building invasion. We therefore cannot affirm the determination that Dueño is a career offender under the reasoning of the district court.
The government argues that, despite this error, we can affirm Dueno’s sentence on one of two proffered alternative grounds. First, the government asks us to rule that breaking into and entering any of the three non-buildings specified in Mass. Gen. Laws Ann. cb. 266, § 16 — a ship, vessel, or vehicle — is a crime of violence under U.S.S.G. § 4B1.2(a)’s “otherwise” clause. See id. (defining crime of violence as one that is punishable by imprisоnment for a term exceeding one year and (1) “has as an element the use, attempted use, or threatened use of physical force against the person of another”; (2) “is burglary of a dwelling, arson, ... extortion, [or] involves use of explosives”; or (3) “otherwise involves conduct that presents a serious potential risk of physical injury to another.”) (emphasis supplied). Accepting this argument, which the government first advanced in the last two paragraphs of its apрellate brief, would entail our becoming the first federal court of appeals to rule that breaking into and entering a vehicle is a crime of violence. We are loath to issue so significant a ruling where Dueño had insufficient oрportunity to develop a factual rebuttal (e.g., the introduction of relevant crime statistics and/or expert testimony) in the lower court.
Moreover, we think it potentially important that the case on which the government entirely rеlies in pressing this argument,
see United States v. Patterson,
The second proffered basis for affirming Dueno’s sentence on alternative grounds presents a more difficult question. The government points out that the Presentence Report in this case contains an uncontradicted account of the events underlying Dueno’s 1994 breaking and entering conviction, that the account (which describes in detail a home invasion followed by serious vandalism) would suggest that Dueño in fact pleaded guilty to breaking into and entering a building, and that
Harris
authorizes us to look at such an uncontradicted account in circumstances such as these.
See
Dueño counters by suggesting that the “archaeological dig” endorsed by
Hams
(which he says we have retreated from) runs afoul of the Supreme Court’s mandate that inquiries into the nature of prior convictions follow a “formal categorical approach [that] look[s] only to the statutory definitions of the prior offenses, and not to the particular facts underlying those convictions.”
Taylor,
Dueno’s first two arguments fail to persuade. Our opinion in
Harris
came two years after
Taylor
and demonstrated full cognizance of the dictates of
Taylor’s
categorical approach.
See
But although the issue is close, we do
agree
with
Dueño
that,
on the
present record, a rеasonable jurist could conclude that there is insufficiently reliable evidence to ground a finding that Dueño pleaded guilty to breaking into and entering a building. In so concluding, we point out that the record in this case lacks even a single document that was before the judge who accepted Dueno’s plea in 1994 (not even a copy of the complaint). Nor do we have a copy of the police report in question (all we have is the Presentence Report, which apparently took its account from the police report); an explanation where the police report came from; or any account of what took place at Dueno’s plea hеaring. We also are mindful that the government bears the burden of proving the applicability of an upward adjustment under the guidelines,
United States v. St. Cyr,
Dueno’s sentence for this crime can reflеct only those prior crimes of which he has been convicted — either by a trier of fact or by his own admission. As matters now stand, the evidence is insufficient for us to conclude, as a matter of law, that Dueno’s 1994 guilty plea constituted an admissiоn to the building invasion described by the police report. We therefore vacate the sentence and remand for resen-tencing. On remand, we fully expect that the government will give this matter significantly more attention than it has recеived to this point.
Vacated and remanded.
Notes
. For some reason, the 1994 state court corn-plaint was never made part of the record.
. In relevant part, application note 2 states that "in determining whether an offense is a crime of violence ... for the purposes of [the career offender guideline], the offense of conviction (i.e., the conducL of which the defendant was convicted) is the focus of the inquiry-”
