In October of 2003, an e-mail had circulated advising that hotel key cards were encoded with not only your room number, but also your personal information to include your name, home address, and credit card number. The e-mail suggested that you destroy the card away, rather than turning the card back into the front desk when checking out.

All of the information available indicates that this e-mail was in fact a hoax and that hotels DO NOT store your personal information on your room keys. However, thieves may be interested in your old hotel keys, as the magnetic stripes on the back can be re-encoded and used in credit card
skimming scams. Basically, you’ll have to decide whether or not you should turn in the hotel room key or just destroy it.

More information regarding this topic in an article entitled “Hotel Key Cards: Identity Theft Risk or Not?” by Martin H. Bosworth with ConsumerAffairs.com.
CLICK HERE to read the article.