Finding deleted users? Remember if your using a forum integration all user matching is over there.
The only tool we have to to mass delete all a users photo's from there profile page. In scan backup you can find and delete duplicate images. As far as deleting unowned images no thats not a feature as how would we do that? Can't really it on a mass ability. Because of the ability to allow unregistered uploads which have no userid there can be no mass delete based on userid 0