(4)The Public Debt Office, Patna, shall on receipt of the requisition or advice in Form "N(11 A)" return the Bonds or cancel them, as the case may be. Further on receipt of the indent referred to sub-rule (3) the Public Debt Office shall issue fresh Bonds. The old Bonds or the fresh Bonds, as the case may be, shall be sent to the Treasury Office in accordance with the procedure prescribed in Rule 31.