On May 20th (the next day) we went out to inspect. The photo below is the top of Hive #1. It seems to be more crowded than we've ever seen it. This makes us think one of three things happened:
A: It must not have been bees from our hive that swarmed, otherwise we would see few bees at home.
B: It was our own hive that swarmed, and they decided to return to the home base.
C: The new swarm wasn't satisfied with the new digs, and came over attacked and took over Hive #1.
Anyway, were not really sure what explains the very full hive at this point, see both of the photos below:
Later we opened the new hive (Hive #2 below). This was where we had just installed the swarm the day before. Guess what? Nobody was home! Where had they gone?
We sure don't have this beekeeping stuff figured out. If anyone has an explanation, please post a comment.

























