19 C.F.R. § 12.104e
(a) Whenever any designated archaeological or ethnological material is imported into the U.S. in violation of 19 U.S.C. 2606, and the importer states in writing that he will not attempt to secure the certificate, documentation, or evidence, or the electronic equivalent, required by § 12.104c, or such certificate, documentation, or evidence, or the electronic equivalent, is not presented to the port director before the expiration of the time provided in § 12.104d, the material shall be seized and summarily forfeited to the U.S. in accordance with part 162 of this chapter.
(1) Any designated archaeological or ethnological material which is forfeited to the U.S. shall, in accordance with the provisions of Title III of Pub. L. 97-446, 19 U.S.C. 2609(b):
(ii) If not returned to the State Party be returned to a claimant with respect to whom the designated material was forfeited if that claimant establishes—
(b) Whenever any stolen article of cultural property is imported into the U.S. in violation of 19 U.S.C. 2607, such cultural property shall be seized and forfeited to the U.S. in accordance with part 162 of this chapter.
(1) Any stolen article of cultural property which is forfeited to the U.S. shall, in accordance with the provisions of Title III of Pub. L. 97-446, 2609(c):
[T.D. 86-52, 51 FR 6907, Feb. 27, 1986, as amended by CBP Dec. 15-14, 80 FR 61285, Oct. 13, 2015]