If delete files from server shared folder where it does go?

If we delete some files (doc,jpeg..so on ) from server by accessing local system where does the deleted files going ?
I didnt find that files neither server recycle bin nor local system recyclebin ?

When I delete files from shared folder they are not first placed in recycle bin
 Some how these files are deleting perminently
How can we restore ? or where does that file can find