Each person whose name or approved A.M.S. code number or other approved designation appears on the label as handling seed subject to this article shall keep, for a period of two years, complete records of each lot of agricultural, vegetable, flower, tree, or shrub seed handled and shall keep, for one year, a file sample of each lot of seed after final disposition of such lot. All such records and samples pertaining to the shipment or shipments involved shall be accessible for inspection by the Commissioner or the Commissioner's agent during customary business hours.