2 and remittances in any form other than as aforesaid shall be returned to the sender thereof by registered post. (2) Such remittances shall be debited with full postage and registration fees and, where applicable, with insurance fees. (3) In cases where remittances are in the form of a banker’s draft, any commission or discount or commis- sion and discount as the case may be on cashing such draft shall be deducted from the amount of such draft and postage stamps shall be supplied to the value of the difference between the amount of the draft and that of the suid commission or discount or commission and discount as the case may be. (4) Stamped envelopes sent to any Post Office for cancellation and posting or return in some other manner shall be sent back ‘“ unserviced ”’: Provided that envelopes which bear appropriate postage stamps and which have accompanied orders for unused stamps may be used for the purpose for which they were provided and the stamps affixed thereto cancelled in the normal course. (5) No person employed at a Post Office may— (i) comply with any request to affix postage stamps to letters for transmission by post or to cancel postage stamps which are not affixed to letters or other items en- trusted to the post in the normal manner; (ii) sell postage stamps taken from some special portion of a sheet or from other than current sub-stock or post letters sent to him for that purpose by any person: Provided that he may sell whole sheets of postage stamps from sub-stocks or counter-stocks; (iii) exchange postage stamps after they have been sold unless such postage stamps have been invalidated under and by virtue of a Stamps Invalidation Order