HogBuster's story reminded me of another.
Many years ago, a friend and I were hunting in Kisatchie National Forest west of Alexandria, LA on a creek near what is now called Kincaid lake. We crossed the clear-running creek on a log and my friend noticed a gun in the sand. He dropped down into the creek and retrieved it. It was a Browning auto-five in 16 gauge, with the gold trigger. He took the gun home and ran an ad in the paper, telling where he'd found the gun, but no one ever called to claim it. As far as I know, it's still in his gun locker.