It has the dust cover and the cleaning rod (most are missing).
It is missing the monopod, bayonet and the two little fold outs on the rear sight.
Ammo is not too hard to find. They shoot really hard. Not a big kick but, you know that you have squeezed off a rifle round.
IIRC, training rifles did not come with the features you say are missing. Neither are they suitable for real ammo.
The clues that this is a training rifles are:
1) One piece stock.
2) No type number on the receiver ring.
3) The rack number is atypical for an issued gun.
4) If we could read it, the ideogram stamped in the butt would probably state that it is a training rifle. Again, I've never seen such a stamp on a live Arisaka.
As for their surplus status, it is
possible that some were surplussed out of the Soviet Union, Indonesia and the UK.
Just to confuse things further, there are "schools" rifles which were worn rifles taken out of military service for training purposes. Most of these are Type 38 long rifles, perhaps from units re-equipping with the Type 99. The one I own has a great looking bore and seems fine to shoot.