That is not a 21-fold pack. It is an awkward reseal of an 85-fold pack. The art is different on the back of the 21:
Also, if you look at the pics there appear to be 46 packs. I now see he says five of the packs are opened.
And it definitely looks like an original box to me. Unfortunately many of the packs seem to have “grabber damage” from the machine that loads the packs into the boxes.
I love the way he emphasizes his “absolutely no returns” policy. We all know that is a joke, if someone buys this item and thinks the packs are resealed they would have no problem securing a SNAD refund.