39 CFR 3050.41: Treatment of additional financial reports.

(a) For purposes of the reports required by § 3050.40(a)(2), the Postal Service shall obtain an opinion from an independent auditor on whether the information listed in § 3050.40(c) is fairly stated in all material respects, either in relation to the basic financial statements as a whole or on a stand-alone basis.

(b) Supporting matter. The Commission shall have access to the audit documentation and any other supporting matter of the Postal Service and its independent auditor in connection with any information submitted under § 3050.40.