Many thanks for sharing this interesting item with us. I have never seen anything like this before, and don't really know what its use would be. I think that perhaps the cabinet served as a field dispensing unit, maybe for a hospital (?)
It's certainly an interesting item, but unfortunately I'm afraid I can't really 100% identify the chest or indeed its purpose / use. I am sure that should any of our other members be able to help, however, they will
Thanks again for posting, and Happy Holidays!