Return-My-Keys Program

Like the old motel keys that said "drop in any mailbox, return postage paid", Ace has a "return my keys" program.

Ace provides a keychain tag that says to deposit the keys in a mailbox.  The post office sends the keys to the address on that tag.  Ace looks up the rewards # on the keychain tag to get the person's mailing address.  Ace mails the key to that address.

1) What would people pay for this service for their keys, per year (or lifetime).
2) Would businesses, such as airlines or rental car companies or car repair shops or credit card companies, pay for this service for their customers?

How about doing this for everything that is portable?  And for engraving on large items?  ReturnMyStuff.com
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turlytag  $3/month

boomerangit  $10/year

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Generic "return my stuff", with stickers placed on each item.
Starts at $10/year
http://www.stuffbak.com/sb/store/list.aspx?id=11