27 C.F.R. § 22.35
(a) When any form or document prescribed by this part is required to be executed under penalties of perjury, the permittee or other authorized person shall:
(b) When the required document already bears a perjury declaration, the permittee or other authorized person shall sign the document.
(Act of August 16, 1954, 68A Stat. 745 (26 U.S.C. 6056))