This cabinet is perfect for my linen closet needs.  HOWEVER , at first i thought it was missing the back plate. After checking out the packaging again , i found a thin cardboard with a smooth white finish.  YES CARDBOARD !! 
sooo cheap !!  And since i was enclosing in with drywall , cardboard was not going to cut it !
So i was forced to head to HomeDepot and picked up a 1/2 plywood, & after painting,  screwed (not tacked) it into place.
The 3 Stares is for peace "B" the pack panel !!