I read an interview with him once where he said he bought a box of magic tricks but never opened it. Could be that. Can't see why that would figure into a Star Wars -Star Trek cartoon though. He's known for so much more.

*Edit*

Found this article about it. Looks like he says movies are mystery boxes. I assume it's that and not that actual magic box he never opened. Still seems a bit of a stretch to put it in the cartoon. The Bad Robot shirt works better.

http://6thfloor.blogs.nytimes.com/2011/06/02/whats-in-j-j-abramss-mystery-box/?_php=true&_type=blogs&_r=0