(a) Every person, firm, or corporation to whom a permit is issued shall keep it on his or her person or at the place where the short-barreled shotguns or short-barreled rifles are kept. The permit shall be open to inspection by any peace officer or any other person designated by the authority issuing the permit. (b) Every short-barreled shotgun or short-barreled rifle possessed pursuant to the provisions of this article shall bear a unique identifying number. If a weapon does not bear a unique identifying number, the Department of Justice shall assign a number which shall be placed or stamped on that weapon.