Or if you could just generate a QR code and print on a sticker saying "if lost, please scan for return details". The QR code takes you to your own website with

Or if you could just generate a QR code and print on a sticker saying "if lost, please scan for return details". The QR code takes you to your own website with return details or a mailto: link. Not 100% fool proof and depends on those who find it having a smart phone but its a cheap hack.