Obviously, the State Park you used wasn't a former war site park. I am picturing Bubba walking through the park with his metal detector and hitting the jackpot. Of course, that could happen in any park.Many years ago I was into an Uzi Model A and had a full auto bolt and short barrel, plus a couple thousand rounds of Israeli steel cased 9mm. I wanted to secure a cache of ammo in a secure location. I used white sewer pipe, glued and capped one end, glued a screw on clean out plug on the other. I filled it with a couple thousand rounds of the Israeli ammo, stuffed an old gym sock in to take up empty space, screwed the cleanout in with its silicone rubber O-ring. Buried it on secure state park land and basically forgot about it for over thirty years, traded the Uzi for a very clean '55 Chevy, went on with life and then remembered the ammo and decided to go see what I could see or find if I could even find it. Went back to the site, there was no evidence I had ever been there other than a rock that didn't belong there was the marker was still there. I dug down, pulled the pipe out and opened it up, the stuff looked like the day I put it there...no Uzi though to have fun with.

Larry