There is no point. We got a lot of Amazon packages and then just throw the boxes in the floor. Whenever a nee package arrives, we throw the other box aways and give them a new one.
We stacked our boxes with the strongest on the bottom, fold the flaps in if you can for extra support, and then we put his cat bed in the bottom. Up top he has a box that extends beyond the box that fits inside of it sideways. We call it his catdominium and it functionally is like a 2 floor "catdo" with a balcony.