39 C.F.R. § 3006.204
(c) Requesting another individual's record. Request for records of individuals which may not be granted under the Privacy Act shall be considered under FOIA.
(d) Requesting a Postal Service record. The Commission maintains custody of records that are both Commission and Postal Service records. Except when the Postal Service submits materials to the Commission in connection with activities under 39 U.S.C. 407(b)(2)(A), in all other instances that the Postal Service submits materials to the Commission that the Postal Service reasonably believes to be exempt from public disclosure, the Postal Service shall follow the procedures described in part 3011, subpart B of this chapter.
(e) Requesting a record submitted by a person other than the Postal Service. The Commission maintains records of a confidential nature submitted by persons other than the Postal Service as non-public materials.
(1) A request made pursuant to FOIA for records submitted by a person other than the Postal Service shall adhere to the applicable procedures of § 3006.205. If such a FOIA request is not referred to a different Federal agency pursuant to § 3006.205(b), the Commission shall consider it in light of all applicable exemptions and in accordance with the following procedures:
(ii) In all other instances, the Commission shall determine the FOIA request after notifying the person of the FOIA request and providing the person with an opportunity to respond within 7 days of the date of the notice under the following circumstances:
(B) The Commission determines that it may be required to disclose the records, provided that at least one of the following applies:
(1) The requested information has been designated in good faith by the submitter as information considered protected from disclosure under 5 U.S.C. 552(b)(4); or
(2) The Commission has a reason to believe that the requested information may be protected from disclosure under 5 U.S.C. 552(b)(4), but has not yet determined whether the information is protected from disclosure.