Every shipment, package, or container containing potatoes which are packed in the State, sold in the State, distributed in the State, offered, or exposed for sale or distribution in the State by any person shall be plainly and conspicuously marked with the name and address of the packer, or the person by whose authority the potatoes are packed or distributed, and the proper grade of the potatoes contained therein. The party possessing the potatoes at any time shall be deemed responsible for the proper marking of the potatoes. On display racks or bins from which potatoes are sold in retail quantities, the proper grade must be plainly and conspicuously shown, but the provision as to markings of name and address or person by whose authority the potatoes were packed shall not apply.