If I'm understanding this category correctly, the box that I collect but don't use in the "its not my problem, kid" level doesn't count. If it does, then add it to my total.

Looking at this again, I think it should be possible to use one fewer box in "the impossible", by going further down and to the side during the drop so you don't need to recollect & reuse the last box out of the drop. Should be possible with superjumps.