Weird find (thanks Kenneth): original Sega Mark III shipping boxes from factory. Contains 20 new games each.
One with Anmitsu Hime (あんみつ姫) and one with Ashura (阿修羅).
Great share Bock. I wish I understood Japanese but those boxes towards the end of the video look amazing. I bet there are collectors over in Japan that have them. I have around 21 Sega Mark III games now so still looking to add to my personal collection.
If you have any left yourself that are doubles/duplications then please let me know. I'd love to see what you have.