19 C.F.R. § 148.111
The baggage declaration, Customs Form 6059-B, of a person (the crewmembers declaration, Customs Form 5129, in the case of a returning crewmember) arriving directly or indirectly from American Samoa, Guam, the Commonwealth of the Northern Mariana Islands, or the Virgin Islands of the United States shall be in writing if it covers articles which do not accompany him and:
[T.D. 78-394, 43 FR 49790, Oct. 25, 1978, as amended by T.D. 86-118, 51 FR 22516, June 20, 1986; T.D. 89-1, 53 FR 51267, Dec. 21, 1988; T.D. 97-75, 62 FR 46443, Sept. 3, 1997]