A report of the salvage derived from the sale of each animal on which a claim for indemnity may be made under the provisions of § 50.3 shall be made on a salvage form acceptable to APHIS which shall be signed by the purchaser or his agent or by the selling agent handling the animals. If the livestock are sold by the pound, the salvage form shall show the weight, price per pound, gross receipts, expenses if any, and net proceeds. If the livestock are not sold on a per pound basis, the net purchase price of each animal must be stated on the salvage form and an explanation showing how the amount was arrived at must be submitted. In the event the animals are not disposed of through regular slaughterers or through selling agents, the owner shall furnish, in lieu of the salvage form, an affidavit showing the amount of salvage obtained by him and shall certify that such amount is all that he has received or will receive as salvage for said animals. In an emergency, a certificate executed by the appropriate Veterinarian in Charge will be acceptable in lieu of the owner's affidavit. The salvage shall be considered to be the net amount received for an animal after deducting freight, truckage, yardage, commission, slaughtering charges, and similar costs. The original of the salvage form or the affidavit of the owner or certificate of the appropriate Veterinarian in Charge, furnished in lieu thereof, shall be furnished to the Veterinarian in charge if it is not already in his possession. Additional copies may be furnished to the State officials, if required. Destruction of livestock by burial, incineration or other disposal of carcasses shall be supervised by an APHIS or State representative who shall prepare and transmit to the Veterinarian in Charge a report identifying the animals and showing the disposition thereof.