No person shall load, ship, transport, or deliver citrus fruits from the orchard where they were produced or from elsewhere within the state in any nonstandard citrus field picking box designed to hold less than 500 pounds, unless the box is clearly and conspicuously marked on an outside end with the word “irregular” and with the cubic content in cubic inches. Any citrus field picking box designed to hold more than 500 pounds shall be clearly and conspicuously marked on an outside end with the cubic content in cubic inches.