I have been working on understanding how the game decides what items go in which boxes. Obviously this depends on what place the player is at the time of breaking the box though. One thing I've discovered so far was that all items in a race are determined at the beginning of each race. So on lap one of a race, the item that will be in the last box on the last lap is already set and will not change. I haven't been able to figure out whether these are sets of items that are used multiple times or if each box is randomly generated at the beginning. I have found other small bits of interesting information such as a theory that it's also possible to manipulate the AI to not use items. I have a recording that shows this but still need to do more testing. I just wanted to let everyone know what I've found so far so they can possibly build off of it.