All books, accounts, contracts, records, vouchers and memoranda pertaining to any or all of the company's property or its corporate or financial affairs (except certificates representing retired and cancelled security issues or other papers the destruction of which has been, or may be authorized from time to time by the Department) must be permanently preserved. All other original records must be preserved pending such further general or specific instructions as the Department shall from time to time prescribe.
220 CMR, 50, 2