International postal agreements— In the case of shipments, the entry or release of which would have been made under section 321(a)(2)(C) of the Tariff Act of 1930 (
19 U.S.C. 1321(a)(2)(C)) before the date of the enactment of this Act, that are sent to the United States through the international postal network, the Secretary of the Treasury, in consultation with the Postmaster General, shall determine appropriate fees and procedures to ensure, to the extent feasible, consistency between the treatment of shipments by the U.S. Postal Service and other shipments, and may prescribe such changes through regulation.