So, you (the scammer) does this but leaves the bottom of the box open, and then remove the item, and glue the box back together, with a brick inside... This is

So, you (the scammer) does this but leaves the bottom of the box open, and then remove the item, and glue the box back together, with a brick inside... This is the same (sort of) reason that mailing yourself something is not proof of anything, as you can mail yourself a bunch of empty, unsealed, envelopes, then seal them with whatever inside them at some time in the future.