Consignments which are damaged may be valued: - either, after sorting, by application of unit values to the sound portion, the damaged portion being destroyed under customs supervision, or - by application of unit values established for the sound produce after deduction from the weight of the consignment of a percentage equal to the percentage assessed as damaged by a sworn expert and accepted by the customs authorities, or - by application of unit values established for the sound produce reduced by the percentage assessed as damaged by a sworn expert and accepted by the customs authorities.