19 C.F.R. § 148.27 Receipt for payment.
Title 19 - Customs Duties
When duties and internal revenue taxes on articles in a passenger's baggage are collected, a receipt on Customs Form 368 or 368A shall be issued to the passenger if such duties and taxes are paid in cash. If such duties and taxes are paid by personal check, the check shall be the passenger's receipt unless a receipt is requested. [T.D. 73–27 38 FR 2449, Jan. 26, 1973, as amended by T.D. 92–56, 57 FR 24944, June 12, 1992]
Title 19: Customs Duties
PART 148—PERSONAL DECLARATIONS AND EXEMPTIONS
Subpart C—Examination of Baggage and Collection of Duties and Taxes
§ 148.27 Receipt for payment.

