I had a crew from the NASA kids program "Our World" come by to take some video shots as background for a story they are doing. I had fun talking to them about bees.
I then went ahead and inspected all of the hives. I just went into the top box to see if they were beginning to put up honey.
Hive #2 and Hive #3 looked very similar - not a lot of stores in the top box, some, but not a lot. Hive #4 had an 80% full top box! So I went ahead and put another box on top of this hive (now five boxes deep)