i cant see any of my missing files on recuva

Hi

Absolutely confused with my recuva search.

A while back i must have deleted quite a lot of audio files relating to a music project.

I launched recuva and although many deleted files came up none from these particular sessions appeared.

I did the deep scan but still nothing.

I,m really confused surely these files even if overwritten must appear somewhere??

Any help would be much appreciated

Thanks