"Office files and memoranda" means all records, correspondence, exhibits, record books, booklets, drawings, maps, completed forms, or documents produced or received by the agency but not defined and classified as official public records; all documents and reports made for the internal administration of the office to which they pertain, but not required by law to be filed or kept with such agency; and all other documents or records determined by the state or local records committees to be office files and memoranda.