My gandma found what she described as a Luger (could also be P38) under a bush or three in the forest shortly after the germans surrender. It was more or less shameful item to have (could indicate any relationship with the german soldiers), so my grandfather hid it away somewhere on his farm..
Eighter he did a VERY good job hiding it, or it got lost during the years. Because today I own the farm, and it's still gone. Closest I got to finding it as a kid, was finding some 9mm rounds.. ..and that's how a non-pistol shooter became a Luger collector
I would be suprised if anyone payed much attencion to matching # post ww2, before they became collective items.