27 C.F.R. § 25.213
(b) Notice. A brewer need not file notice of intention to return beer to a brewery other than the one from which removed unless required by the appropriate TTB officer. When a notice is required, the brewer shall serially number each notice and execute it under penalties of perjury as defined in § 25.11. The brewer must file it with the appropriate TTB officer. The notice will contain the following information:
(c) Return of beer. If the brewer is required to file a notice of intention to return beer to the brewery, the brewer may bring the beer onto the brewery premises prior to filing the notice. The brewer shall segregate the returned beer from all other beer at the brewery and clearly identify it as returned beer. The returned beer will be retained intact for inspection by an appropriate TTB officer until the notice has been filed and disposition authorized.
(Sec. 201, Pub. L. 85-859, 72 Stat. 1335, as amended (26 U.S.C. 5056))
[T.D. ATF-224, 51 FR 7673, Mar. 5, 1986, as amended by T.D. ATF-437, 66 FR 5479, Jan. 19, 2001]