lol wow, so many fails for thinking he meant a sealed box.
obviously you have your answer that it is hard to do a 50 out of a trunk. i know a member on here who did manage some high numbers out of his trunk but he built a new box damn near every other week until he figured out how to do it. so, at the level i'm assuming you are at, you will either need to build lots of boxes or find someone who has already done it.