Don't mean to Jack the thread, while this doesn't count as a "casing" find it is an interesting story. Way, way back when I was living in Clarksville TN, right outside of Ft Campbell KY, I found a live, unfired 30mm canon round in my backyard. Along with two empty beer kegs. It was corroded, the primer was still intact but there was no blue paint signifying a dummy round. It was proudly displayed in my home for years until a friend of mine, former 82nd Airborne, warned me that it was dangerous to have a corroded, presumably live round hanging around. With great sadness I finally dropped it off a bridge into a local river.