An internal auditor was assigned to conduct an inventory control and stock room area engagement. During the audit, the auditor observed that there were some items that have a shelf life expiration date requirement based on a certificate of conformance received with the product. The certificates of conformance are kept on file in the inventory area office and the expiration date is verified at the time the item is taken from stock. The auditor reviewed the items in the stock room and also on the production floor for the expiration dates to see if there was any expired product. All items with a shelf life requirement were found to be within the expiration date requirement. Which of the following recommendations would be appropriate?