not sure what operating system you are using?

but if windows use windows explorer and search your hard drive for one of the files. If you can remember the name. or file type like .mp3 etc.

Normally a file recovery program will list the files that are recovered, not sure why your's didn't. It is possible they may have been over written and are unrecoverable now. I'm sorry if this is the case.

It has happened to me before, and I had to start over again.