Could be wild bees since I would think you would know if anyone that close had bees.
I was wondering if you had bees yet. We lost one hive but it wasn't a very productive hive so I don't consider it that much of a loss. From the first they just collected enough to feed themselves, no extra honey for us and they ate like little pigs when it was warm so starved even though they had plenty of honey going into winter.
