27 CFR 70.607 - Supporting evidence.
(a) The claimant shall support the claim with any evidence (such as inventories, statements, invoices, bills, records, labels, formulas, stamps) that is available to submit, relating to the quantities and identities of the liquors, on which duty has been paid or tax has been paid or determined, that were on hand at the time of the disaster or other specified cause of loss and alleged to have been lost, made unmarketable, or condemned as a result of it.
(b) If the claim is for refund of duty, the claimant shall furnish, if possible:
(1) The customs number;
(2) The date of entry; and
(3) The name of the port of entry.