Recovering CF Files after formats

I imported a family session on to my computer and went to do another shoot. After a couple of days I came back to find that some of my images were missing. I have no clue where they are and how to get them back besides going to the CF cards and recovering them. However, I've already shot over those pictures. I've tried using multiple software solutions but for some reason none of them are recovering files besides what are currently on the cards. I've tried RescuePro Deluxe, Pc Inspector and DiskInternals Flash Recovery. Is there a way to get these files back? Am I doing something wrong with these programs?

You can recover files from a memory device (card, disk drive, etc.) only if you have not overwritten them with other files. Once you've overwritten the space with new files, what used to be on that space is gone forever.

Merely formatting a CF card does not literally erase the files. I needed to recover some files on a CF card that got corrupted and the process actually brought back many very old files that had never been overwritten. I apparently never filled the card as much as it had been quite some time before.

Check this sticky for more possible solutions.