At any reasonable time, a representative of the Department may enter any factory, warehouse, or establishment in which a product is manufactured, processed, packaged, or stored and inspect any pertinent equipment, labeling, or finished or unfinished products. On entering any factory, warehouse, or establishment to make an inspection under this section, the representative of the Department shall present appropriate credentials to the owner, operator, or agent in charge. During any inspection under this section, the representative of the Department may obtain a sample of any product, package, or labeling. When obtaining a sample under this section, the representative of the Department shall: Pay or offer to pay for the sample; and Give the owner, operator, or agent in charge a receipt that describes the sample obtained.