NOI, in boxes or crates, shipper must certify on shipping orders and bills of lading at time of shipment the actual value per pound of the property. If shipper fails to certify the actual value per pound, shipment will not be accepted, but if shipment is inadvertently accepted, charges will initially be assessed on the basis of the class for the highest valuation provided. Upon proof of lower actual value, freight charges will be adjusted to the basis of the class applicable in connection with such actual value.