Reverse art is most likely the cover of Japanese Volume 5 (aka Aniplex Volume 3)
Box #2 contains:
- Episodes 10-19
- Textless Opening and Ending
- Previews (after each episode)
- Booklet containing content from Japanese Volumes 2 and 3
- Chipboard box to hold digipacks
I'm going to bet Box #3 will use the Japanese covers of Volume 7 and 8 with 9 used somewhere as a filler box or alongside another piece of art for the overall box to hold all three parts.