I had a small swarm take up residence in a bait hive. They drew out several small combs. Besides pollen and uncapped honey, there were brood cells and a queen cell, all capped. The bees have since disappeared, and I discovered that the capped brood and queen cells are empty. Some of the caps had small holes in them while others were still sealed. I've never seen this in my other hives, or even heard of it. Why would they cap empty cells? Has anyone else seen this?