Halle... The way to spot new from old is with the back cushions on the sofa itself. If they fit on the sofa then it is the old mattress. If the back cushions are higher up than the back of the couch and will not go flush with the back then it is the new matress, as they fold differently and don't allow the back cushions to be flush with the back of the sofa. Not sure how many buildings are left, but they are working on it.