I picked up my newest bot at TRU on the way home. I bring him home, and no knife, nothing to try and open it, the box flips open. I am talking about a Legend's sized figure here, so it's not a big box.
It did happen to me on a deluxe class. The plastic bubble flipped open easily more than half, not whole though. Makes my job much easier. I've seen those in stores, too. The card was still on the hook but the toy was below. Guess Hasbro just tried to save on the glue as well.