I got off work early, so I thought I would give this a try. I didn't hold out much hope, though, if the likes of kungfuhippie were foiled!
I tromped around "GZ," (was it ground zero?!?!), and left no stone unturned. I thought I had it for sure when I saw a rock that was doing the splits; but, alas, it was not. I also saw a couple Budweiser cans, but not that very special stone, Keystone Light.
I'll have to give this a shot later on, but I think I'll wait for the snow to melt before I head out again!