Three Japanese missing in WWI

Hello, I've been trying to answer an impossible question. I don't even know if it's even answerable, but it's fun trying (and frustrating). So the question is, there were three Japanese missing casualties in WWI. Can I find out who these men were? Usually there aren't any names written down for casualties since there are so many, but three is an incredibly small number of missing persons so I was wondering if it's possible to find out who they were. It's really pointless, but fun anyway. Any help? If it's unanswerable, then I'll just accept it as that.