I have been on top of my hives, and kept them with plenty of room. All my hives have 2 deep boxes for brood. The only ones that don't have a honey super, are new colonies that have not finished enough of thier 2nd brood box. I did requeen 3 of them, for shotgun brood, a week ago. This morning everything is fine. This afternoon, I go to check a swarm that I put in a hive, and find both of my swarm traps are full of bees. Just looking at the hives, I don't see any difference in the hives. There are about a dozen hives, about a half mile from me. I just don't have a clue, except to say that they probably came from my hives.