Man, do you give off EMP blasts or something? Or do you just own a bunch of stuff that's 10 years old?
If there's no sign of the files, then they're probably gone. This happened to me about three years ago and, since then, I've backed that shit up on my harddrive, on an external harddrive, and in Dropbox once a week.
As to fancy backdoor rescue kind of stuff... Maybe the computer folks here do have an answer.