Pursuant to 19 U.S.C. 1508(c)(3) , all records which pertain to the filing of a drawback claim or to the information contained in the records required by 19 U.S.C. 1313 in connection with the filing of a drawback claim must be retained for 3 years after liquidation of such claims or longer period if required by law (under 19 U.S.C. 1508 , the same records may be subject to a different period for different purposes).
19 C.F.R. § 190.15