Yeah, I bet that's it. Makes sense if the seller got the box from Pavcraz.
Pavcraz so far has been THE source for these. He's the guy with the Akro stamps. And he puts them on all sorts of boxes. Every other example I've seen like this so far has traced back to him, sometimes through his alternate identities or his friend in Washington state, or one guy in the UK who was reselling something he bought from Pavcraz.
That could very well be it.
Heck, if I'd still been watching Pavcraz auctions, I woulda known. But I gave up on following him some time ago.