I don't think so. When he divides the box, you can see it is not twice as long as the cards were when shown. Have a look again. So I think it's something else, but what I have no idea.The front view you have is distorted, the box is 2 x longer than the cards.
When he 'cuts in half', the blade is actually at the end of the cards.
Consider too, you can't cut cards so easily like that with a blade.
When he gives the first view of the empty box, it is dark inside, ie partioned off.I don't think so. When he divides the box, you can see it is not twice as long as the cards were when shown. Have a look again. So I think it's something else, but what I have no idea.
Of course he doesn't actually cut the cards.
When he gives the first view of the empty box, it is dark inside, ie partioned off.
It's a double box, the cards only slide halfway through.