I own such a rifle. An Arisaka type 99, 7.7mm bolt action, which I inherited from my father. He acquired it as part of the US occupation force in Japan. I couldn’t imagine turning it in to some government wankers.
Dad kept it under his bed, and us kids enjoyed playing with it when we had the chance. The tip of the firing pin had been broken out of it, by the USMC according to Dad. The chrysanthemum had been X’d over by the Japanese before surrendering it.
I let them display it at Fort McArthur Military Museum for a few years, until someone tried to steal it from the display case. Now it’s back under MY bed... which is where Dad liked it. :)
I own one too, minus the bayonet. I inherited it from my dad. I have shown it to many knowledgeable people and not one thought it worth putting in a museum. It was made by Mauser, something I believe the article failed to mention. Mine has the chrysanthemum intact. Years ago I managed to track down some 7.7 Jap cartridges and got to fire it. It’s a beast; that steel butt plate is very unforgiving.