(b) If the chief executive determined in the law-enforcement agency's unclaimed stolen property report that any firearms or ammunition in the law-enforcement agency's possession are of a sufficient quality to be traded in on new weapons or ammunition for the agency or appropriated for the agency's use, the chief executive shall cause the firearms or ammunition to be traded in on new weapons or ammunition or appropriated for the agency's use. After any trade-in or appropriation under this subsection, the law-enforcement agency shall file a report with the treasurer and the state tax department on the trade-in or appropriation.