These can be used to get the upgrades like max ammo double points nuke etc, I am not exactly sure how it works but if you destroy one of them, you will get all of the upgrades the next round. I believe it is the next round it might be that round.. I don't really use them much there are a couple on the map not just in the theater. I am not sure if there is a specific way you need to destroy them (knifing or shooting) but I found this out playing on Xbox live after a player told me about this. He went on to destroy the box and things went exactly as planned and we got all the upgrades in one round pretty quickly. I am not sure if the power needs to be turned on first to do this I haven't really tested it much.