Seems odd it would take up space for two years given the dire circumstances.
An unsalvageable defect (but why not scrap it)? Designated for a non-military use but never completed? A (non-slave) worker or govt employee on-site take a souvenir home?
Why is the firing pin numbered?
some one spent money on it ....
Neca eos omnes. Deus suos agnoscet.
Factory error rare SS K98 bnz43 all matching with no serial number on the receiver. BIN reasonably set at $5,250. I can see the headlines now