Things being lost - back in the 80‘s we were using a Soviet style defensive position in the spring. Leaning against the wall in a nearby trench was a 9mm SMG w/sling, BFA attached, full mag, cocked, and on safe! Mild surface rust, so maybe been there over winter or the previous fall.
We turned it in, and we were later told they did not even know where it came from, and who really knows whats happened to it since.
Wierder things have happened.
In 1990, I found a C7 bayonet less scabbard, and it too had been there over the winter.
One other time when in the winter, when the C1 was in use, a guy from our tent group lost his breech block. It was gone in the snow!
In the spring we went back to the same area to find it, and there it was. Found safe in the need of a wee bit of CLP.
Regards, Wes