Each first handler and importer, including those who are exempt under this subpart, must maintain any books and records necessary to carry out the provisions of this part, and any regulations issued under this part, including the books and records necessary to verify any required reports. Books and records must be made available during normal business hours for inspection by the Board's or Secretary's employees or agents. A first handler or importer must maintain the books and records for two years beyond the fiscal period to which they apply.