Dad brought home a few from the pacific. His garand (his claim) an ariska (mum intact) and a set of swords taken in battle by him. Korea turned up a carbine. He never revealed how he got them home. All of which came into my possesion after his death. The Swords were not military issue and shortly after he passed, I returned them to the Japanese consulate to be returned to the proper family by custom. Dads rifles are kept in a glass case along with his medals in my gun room. I have no reason to doubt his word.
No such thing as a stupid question. What is stupid is not asking it.