Mine did.Both of the Arisaka's (type 99 from appearence) have collector value. They both appear to be in pretty nice shape. The first is as Uncle Mike stated above. It is collectable but not nearly as the second with a complete Chrysanthemum and the dust cover. It's a rare Arisaka that has an intact Chrysanthemum, dust cover, and the anti-aircraft sight. If they both fire (and from the looks of them they should) There's a nice bit of value there, especially to the right collector.
Check out Markings on Japanese Arisaka Rifles and Bayonets of World War II It's a pretty good source for decoding the stampings found on your Arisaka's.
Did your dad capture any of the bayonets or Samurai swords?
He brought back the bayonet for the rifle and two "military" swords.
One Non Com and one Ranking Officer sword.
My Type 99 doesn't have the dust cover or the cleaning rod.
Dad said that the Japanese troops would remove the dust covers because they made too much racket when walking through the jungle, and most of them got rid of their cleaning rods because they were constantly getting snagged on the dense underbrush. The Japanese Soldier favored stealth whenever it was practical and anything that interfered with that was eliminated.