Chase Bank recently lost a backup tape containing their customer’s personal information including social security number, name and address. They said that there’s no evidence that the tape has been used, but how do they know.
http://www.whas11.com/news/consumer/stories/081809whascwConsumerWatchChaseBank.f2187dec.html
Here’s a link to the letter they sent to their customers:
http://www.bankinfosecurity.com/external/chase_breach_notification_letter_9_10_09.pdf
The letter states that you need special equipment to read [...]