what version of max are you using? Does it have particle flow?

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max 9 32 bit

yes it has particle flow, but i want the pieces of the box to collide with the ground and walls.

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yeh, you can do that with particle flow. Create the particle flow, a gravity spacewarp, and a Udeflector for the ground and each of your walls. Remember to select the ground and walls in your Udeflectors and open up you particle view. Add a force operator and select the gravity space warp. Add a collision operator and select all your Udeflectors. You should get something like this:

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You can add other spacewarps such as drag and wind to get a more realistic result.

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And I should probably mention that you can use particle flow to explode objects like you want...

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