Obsaleet,
Those ground wires tied to the back of the box were the worst thing to work with. If you didn't know how that was wired, you would loosen the nut on the inside of the box and then you were screwed, because you couldn't tighten it back up. Nor could you attach a new ground wire to it. I used to tell all me helpers, if you don't see the ground wire inside of the box, check for a bolt/nut on the bottom of the box. Then check for proper grounding of the box. More than likely, the box was properly grounded on the outside back of the box. Then we would have to use a ground clip to ground the new wire to the same box.
