Hi, beginning beekeeper here. I have 2 warre hives. Installed them from packages about May 1st, in northern Illinois. Set them up with 2 hive boxes. Everything has looked fine, 2 weeks ago both colonies had filled all of the first box with comb. Today as I walked back I saw them swarm up to a tree then take off. Looked like out of one hive, was hard to see. So my wife and I added a box under each hive to make it 3. We saw that the hive that swarmed had not even started any comb in the second box, so for 2 weeks they had no room to grow in the first. Why did they not move on to the 2nd box? And now should we remove the 3rd box? The hive that did not swarm only had a little comb started in the 2nd, does not seem like they need the 3rd box yet, but I don't want to be too late. Thanks. Attaching pics of the hives from underneath the second box.