The boxes and ammo are just modifications of things found in my leftovers containers. As you say, there seem to be no commercial products available to help with this. I looked at a lot of period photos, some of which include ammo boxes, so these are roughly the right size and shape I think. But the photos also indicate that the Japanese used multiple kinds of ammo boxes for the same weapons.

Great...really good job!
I'm trying also to reproduce some ammo boxes, loading cartridges for 13 and 25mm AA and of course ...most needed, feeding stripe for the type 92 HMG.
Results for the moment are acceptable but not what I want.....I'm a diorama builder so for me the closer to the real thing the better :sunglasses: