Hi Mindy,
We have production boxes like that in our store sometimes. Typically what a magician will do is open both doors, put both hands inside the box, one through the front door, and one through the top door (that way if the audience sees a reflection they think it's the hand going through the top) to show that the box is empty. The they close both doors, make a magic gesture over the box, open the top door and produce something out of the box. Or they put something in and then show it empty.
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