I think the mystery box should randomly choose an effect most of the time they are bad and sometimes are good so you can either use it yourself for a hopeful good effect or use it as a mine hoping the enemy will use it or possibly have a cammo Edit: or they should randomly be in the world camoed and if you get to close it springs and dose x effect on y team
heh or makes snipers spawn infinitley in a nearby thing and kills you if you try to leave unless you blow the building up by doing only what the game tells you hehehe