@
mariekes - the rationale behind my suggestion to run something like Recuva was get an indication that the EPUB's have been permanently deleted. Recuva and NTFSUndelete will usually find fragments of such files and report them by name - if they didn't find anything that would suggest to me that they're hiding somewhere - like another drive.
I just did a shallow scan with Recuva over 5 drives - took about 5 minutes, a deep scan would take a lot longer
After the scan I got Recuva to search for *.txt files, the ones with a green dot are recoverable. Best practice is to recover them to another disk, if you recover them to the disk where they were then they might overwrite another recoverable file.
BR