19.262—General requirements for filing claims.
(a)
A proprietor must file all claims for abatement, remission, credit, or refund under this part on form TTB F 5620.8, Claim—Alcohol and Tobacco Tax and Trade Bureau Taxes. The claim must:
(3)
Be signed by the claimant or by the claimant's duly authorized agent under penalties of perjury as provided in § 19.45; and
(4)
Include any supporting documents required by this part. The supporting documents will be considered a part of the claim.
(b)
The appropriate TTB officer may require that the claimant submit additional evidence or documentation to further support the legitimacy or accuracy of the claim.