All records required by this part, documents or copies of documents supporting these records, and file copies of reports required by this part shall be retained for not less than three years, and during this period shall be available, during business hours, for inspection and copying by appropriate TTB or customs officers. Furthermore, the appropriate TTB officer may require these records to be kept for an additional period of not more than three years in any case where he determines retention necessary or advisable. Any records, or copies thereof, containing any of the information required by this part to be prepared, wherever kept, shall also be made available for inspection and copying.
(68A Stat. 731 (
26 U.S.C. 6001
); Sec. 201, Pub. L. 85-859, 72 Stat. 1342, 1345, 1348, 1361, 1395 (
26 U.S.C. 5114, 5124, 5146, 5207, 5555
[T.D. ATF-50, 43 FR 20494, May 12, 1978, as amended by T.D. ATF-451, 66 FR 21670, May 1, 2001]