Since the Smart Key (SKS) is sooooo expensive to replace, decided that engraving it with contact information would be "smart". They are plastic, so any sharp tool will easily scratch info into it. I put my cell phone number on it. Don't give or put a home address, as someone might then steal the car, but cell phones aren't easily connected to a home address and could result in a fast return of the key. Even a DL# or License# can lead to a home address, for a small fee. Anyone have suggestions, info or comments (i.e. $50 reward, etc)? There are some "key return" companies in which you attach one of their tags with a unique ID on the key.