Those weren't original on underwoods in 43 were they?
No, I dont THINK those showed up til mid to late '44.
I have a Garand, a Carbine, and several 03's and 03-A3's that have all been arsenalled. Some of them look no different at all from photo's I've seen of non-arsenaled rifles. 60+ years is a lot of time for 'stuff' to happen to rilfes. Even when they were re-arsenalled, they didn't come out looking pristine.
Can you tell us what stamps you saw on the stocks?
EDIT: Wait a minute. If the rifle was a "bring back" from Greece, Norway, or any other country we loaned them to- that wouldn't be 100% dis-honest... just 99% dishonest. I know some guys must have been able to bring their rifles back on the sneak, but still- the arsenalling happened a lot in-country and here in the states.