It says, up to 4 boxes per day, which means, you may be able to get 4 boxes, you need to get chances. That is how I understand it. You need to get lucky to get 4 boxes, you will get 3 boxes for sure, but the 4th box, is a chance you have to take to see if you get or dont get. Its really all there in black and white. Just got to learn how to understand it in SDE terms lol. I am also guessing the 4th box, is like a random item you would get in a gb room or a blitz room, you got to play the odds. Until someone from TNF/SDE can clear this up, then this is how I am understanding it.