The label of the box is interesting, I ran the image through my smart phone's word recognition translator and some of the symbols were recognized as the following in English:
Goods
Water
Extraction
Spring
"first whether the stone, is a spring input"
Spring water
I don't speak Japanesebut I wonder if the box originally held a bottle of spring water, or is basically describing a product like Sake (rice wine)
The overall complete label translates as gibberish on my phone, but picking the few words out, assuming they are correct, doesn't suggest an ammunition container.
This is the first time I have tried Japanese to English, but the same program has been quite good with Russianto English.
It might be an interesting project to find some to translate the label properly.