Photoshop :: PSD Files Vanished - CS6?

I am in charge of marketing at a financial institution and have a pretty vast experience with CS6 and prior versions as I use it regularly.  For a little background, I have been designing ads and marketing materials for campaigns professionally for years and using PS/CS since the original version.I save all my files to a share drive on our server at the corporate office; it is extremely stable and have never had an issue doing so.
 
Recently I received a new PC for work and upon getting it set up I realized some of my project folders have the rendered PDF files inside but the original raw PSD files are completely missing.  They were not moved, nor located on the old hard drive as I stated before; this was a shared drive on our network.
 
All my other files; mp3/wav/mp4/.doc/favorites/pdf/tiff/jpeg/etc etc are all there and intact but it seems that folders with large numbers of PSD files are now all sans PSD documents.  Its like they vanished completely.I searched the drives that I use regularly and my harddrive(s) but they are simply gone.This is detrimental.
 
I have seen issues like this pop up when I searched for answers but it seemed it was always user error; losing the files, hidden folders, user rights, hard drive errors, misplacement, expectations of file recovery actually working 100% of the time..These are not recovered files, they were ones I accesed and used regularly; everything from logos, poster designs, large format billboards etc.   There are some folders with PSD files in them, some not.No other file types are missing, this is a PSD isolated issue.