28 U.S.C. § 1743
Section 1743 · Demand on postmaster
Current version, with additions and removals from the June 25, 1948 version.
The certificate of the Postmaster General or the General Accounting Government Accountability Office of the mailing to a postmaster of a statement of his account and that payment of the balance stated has not been received shall be sufficient evidence of a demand notwithstanding any allowances or credits subsequently made. A copy of such statement shall be attached to the certificate.