Gypsi- "There are a lot of options. First thing is clip the wandering queen and check the hive for another one I think
Good idea, the only thing is, when I open up the hive to find the wandering queen, and clip her, then find another queen, how do I know which one is the wandering queen? Or, does it really matter? Leave both queens in and like Iddee said, let the bees do the dirty work...
On of the scenerios in my head:
It has occured to me in my junior knowledge of beekeeping that this may be a small swarm from one of the neighboring hives. Maybe they lifted out and landed on top of next door hive?
I have been reading posts of several who are finding very small swarms this late in the season.
I think I'll first go with Iddee's suggestion and wait one week, check for queen and/or eggs, if there aren't any signs, combine. In the meantime watch for and events like this again, then the plans will change.