Section 5.01 - Work Records(1) Every employing unit shall keep sufficient records: (a) To enable it to prepare accurate reports with respect to its employment as may be required by the Commissioner; and(b) To enable the Commissioner to verify any report submitted by the employing unit; and(c) To make it possible by an inspection thereof to determine with respect to each worker: 1. Wages earned by calendar weeks.2. Whether any week was in fact a week of less than full-time work.3. Time lost, if any, by such worker due to his unavailability for work, or inability to work.(2) Any employing unit found to be in default with respect to the requirements of 430 CMR 5.01(1) will be duly notified in writing and failure to correct such default shall subject the employing unit to the penalties set forth under M.G.L. c. 151A, § 47.(3) Payrolls, working sheets and other records from which information is assembled for the preparation of reports and the duplicate of reports filed with the Department shall be preserved for a period of four years from the date on which the report was filed.(4) Employers shall post in conspicuous places accessible to all their employees any notices affecting benefits when so requested by the Commissioner