Sometime in 2012-2013, some Russians were out dicking around in the woods with metal detectors and got a huge ping (Just one ping, Vasily) from right below the surface. They started digging and found a whole damn motorcycle.
Info on this guy is vague, but this is what we know. It was found in Russia (see above) by some hobbyist explorers. It's either a DKW Luxus 300 or a licensed Russian copy of said DKW called the Krasnyi Oktyabr (Red October). Sadly, that's it.
How did it get there? Why was it buried? I certainly couldn't find any further info or followup articles on it, so it'll probably have to remain a mystery.