If you pull those extra number (stickers) off the registered mail and put them on the coupon you are sending with that registered mail, which gives the coupon an identifying number, then they would be registered in the public and can't be just stolen?
Printed copy · Anthology Volume 9, page 587Printed copy from The Tender For Law Anthology, Volume 9, page 587 (printed 13 June 2014). Added by this site; not part of the Facebook export.