i don't understand the question, very well but i think you can use baking texture or prepare one texture with the two faces that you want to show, like Jeff said it can't be done, you have to combine the two jpg in one.
4711 I didn't know that maybe that could be the right solution but you have to create the box in vizard, and maybe sqwiggily want to do it in a program like 3ds max or maya
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