Any person, firm, or corporation who sells, ships by mail, express, or otherwise transports within or without this state raw furs, skins, or pelts of fur-bearing animals, the taking, capturing, killing, or catching of which has been done without first procuring a fur catcher's license, shall be guilty of a misdemeanor and, upon conviction, shall be punished by a fine of not less than two hundred fifty dollars ($250) nor more than five hundred dollars ($500) for each offense; provided, however, that nothing in this section shall apply to commercial shippers and common carriers which merely ship or otherwise transport raw furs, skins, or pelts by request of or contract with the possessor or owner thereof.