heres a muffin box, it was pictured stacked in some SF photo from iraq or afghanistan.

This is an older pattern and i think i forgot somthing. It bulds up fine but if there is somthing wrong i think its the final 2 flaps (lid) closing (i believe one over laps other too much or somthing)

https://www.onesixthwarriors.com/photo/data/503/290Muffinboxjpg.JPG