Some hilarious ideas in this thread about the way Europeans react to dug up ammo. Even today there are parts in this country where farmers can’t plow a field without finding some unexploded artillery rounds (some containing mustard gas). They don’t panic, but just pick them up, pile them by the side of the road and when they’re finished plowing they might call the police and let them know about that stack of high explosives. They ain’t even going to bother with picking up some cartridges.
I once bought a batch of surplus ‘7,62 nato’ that turned out to be badly corroded. Rather than going true the effort of digging a hole or spending money to have it disposed, I had my brother (doesn’t have a gun license) call the cops and tell them he found it in his basement. They came to pick it up … for free