I used to dig for all sort of memorabilia when i was in europe. I found tons of stuff.... ppsh, stg 44, dozens of mauser, most where badly corroded but some where in exeptional condition after spending several decade underground. Once my father did dig out the wing of a p51. We knew the pilote had jumped, so we had no concern about legality. Since it crashed vertically, there was not much left lof the wing, but the 4 , 30 did survive.... well, correction only one survived and was given to a local museum....