www.stuffbak.com
They have labels u can order you place them on laptops bags pdas or cell phones car keys or anything else key chains and stickers
You go onto that site and register them
If someone finds them you can offer a reward and the site will ship the missing thing to you privately (finder sends to stuffbak then sb to you for confidentiality)
Reward is optional
Ive attached one to my backpack notebook case and laptop
very useful stuff