You do recognize the box, do you? Usually it is used to load something into the box. But you can see it can be used to steal something out of the box as well. The preparation is done right in front of the audience. The angles are a litte issue. Basically the eyeline of the audience needs to be below the upper edge of the box. But otherwise you are fine. The transposition idea is just there to illustrated what can be done, besides just stealing.