For the purpose of checking and verifying reports filed by handlers or the operation of handlers under the provisions of this subpart, the Secretary, and the Committee through its duly authorized agents, shall have access to any premises where prunes may be held by any handler and at any time during reasonable business hours, shall be permitted to inspect any prunes so held by such handler and any and all records of such handler with respect to the holding or disposition of all prunes which may be held or which may have been disposed of by him.