Went back into the hives today to see what was going on.
Hive #2 still going strong, four medium boxes high. Brood in three medium boxes, larva and eggs visible. Honey being put up in the top box.
Hive #1 was three boxes, a deep and two mediums. The top box was empty of activity or stores. The middle box had some honey, but not much. The deep had all of the activity. I did pull up a frame and it had larva and eggs so, I'll leave it alone for a while. I did remove the top box til they start getting busier.
Hive #4 was similar, it is two medium boxes high. Some honey in the top box, but all of the bees in the bottom box. Again, I pulled a frame and saw brood, larva and eggs, so we'll see.
I went ahead and put syrup on all of the hives. I did not see any queen cells. There were a good number of drone cells (a whole frame of them in #2).
So, I am a little worried about #1 and 4, perhaps a more experienced beekeeper would have replaced the queens - I'll wait and see, unless I get other advice...?