Manipulation in warehouse

Merchandise shall only be withdrawn from a bonded warehouse in such quantity and in such condition as the Secretary of the Treasury shall by regulation prescribe. Upon permission being granted by the Secretary of the Treasury, and under customs supervision, at the expense of the proprietor, merchandise may be cleaned, sorted, repacked, or otherwise changed in condition, but not manufactured, in bonded warehouses established for that purpose and be withdrawn therefrom— for exportation to a USMCA country if the merchandise consists of goods subject to USMCA drawback, as defined in section 4534(a) of this title, except that— duty shall be paid on the merchandise before the 61st day after the date of exportation, but upon the presentation, before such 61st day, of satisfactory evidence of the amount of any customs duties paid to the USMCA country on the merchandise, the customs duty may be waived or reduced (subject to section 4534(e) of this title) in an amount that does not exceed the lesser of— without payment of duties for exportation to Canada (if that country ceases to be a USMCA country and the suspension of the operation of the United States-Canada Free-Trade Agreement thereafter terminates), but the exemption from the payment of duties under this paragraph applies only in the case of an exportation during the period such Agreement is in operation of merchandise that— for exportation to Chile if the merchandise consists of goods subject to Chile FTA drawback, as defined in section 203(a) of the United States-Chile Free Trade Agreement Implementation Act, except that— duty shall be paid on the merchandise before the 61st day after the date of exportation, except that such duties may be waived or reduced by—