All of the records, forms, and documents required to be retained by § 17.170 shall be kept at the premises where distilled spirits are used in the manufacture or production of nonbeverage products and shall be readily available during the manufacturer's regular business hours for examination and copying by the appropriate TTB officers. At the same time, any other books, papers, records or memoranda in the possession of the manufacturer, which have a bearing upon the matters required to be alleged in a claim for drawback, shall be available for inspection by appropriate TTB officers.