Back in my teens I had a friend whose father was a general jack-of-all-trades and did home remodeling, building demolition and many other similar types of work. I was aware he had found numerous guns (rifles and pistols, I saw them) he had found during demolition work. As far as I know he always kept what he found. I specifically remember one as I shot it - A Walther .22 Olympia Pistole match pistol. It was in sad shape but it still fired.