Opinion Needed: Originality of Remington 03A3

[M100C]

polska,
I bought it at a local Field & Stream:

https://drive.google.com/open?id=0B8...nlFRXNBM2VoeTg

All,
There is more to the story. My daughter's boyfriend gave me a heads-up when the gun came in (he works there). The guy that brought it in said it was his father's gun from WWII, and he also had a Japanese rifle (Arisaka?) he took from a soldier he'd shot with the 03A3. He had no one to pass them to, and wanted someone to enjoy the gun. The store bought the 03A3, but passed on the Arisaka. I am going to see if the store will put me in touch with the original owner.

I had doubts about this all being true at the time I bought the gun (and, didn't care, as I headspaced and gauged the muzzle (+1.5) in the store, and expected it would shoot well), but then as I took it down, and looked at the authenticity of all the parts, it had me wondering if this was true!

If this gun was a "bring-back" gun, were they marked in any way? What might I look for?