Every precious metal dealer shall keep in possession at the dealer’s business location or other location within the licensing county from the time of the transaction or as close thereto as possible, for a period of no less than 14 days, every secondhand item containing precious metal purchased by the dealer unless the item is purchased or consigned from another dealer licensed under section 325F.733. The item shall not be altered at the time of sale and shall remain unaltered during the required holding period.