briansnat: Saw JC's note and ran over to check it out. It certainly looked like someone left in a hurry. As I stood by the cache I started to hear the same buzzing noise, so I picked up the container, logbook and other stuff and hauled out of there.
I came back a few minutes later once the hornets calmed downto see where the nest was. Turns out it's a hole in the ground about 10 feet from the cache. There were a LOT of them.
The camo is rotting away, so it's time for this to go anyway. It's had a good run.