Penn & Teller on Broadway -- Box trick

I recently saw Penn & Teller on Broadway and it was a really great show. I keep wondering about the very first trick of the show - Teller appearing out of a wooden box that had previously been inspected by audience members.

I’m one of those people for whom part of the fun with magic is trying to figure out how they did it. Knowing (or thinking I know) how they did a trick doesn’t diminish my enjoyment of it and usually just emphasizes the skill involved.

I have a theory about how the trick was done, but it’s not complete. The shtick is that the wooden box is on stage before the show begins and audience members are encouraged to inspect it, get in it, take pictures with it, etc. Then just as the show begins Teller pops out of the now closed box.

What I noticed was the last two audience members who inspected the box, and what they did with it. And then the stage hand who casually adjusts the location of the box after the stage is cleared. Did anyone else pick up on this?

Yes. The last couple of people always turn the box around to take a picture. After that the opening can easily be accessed from the back.