l looked at one of my strongest hives, no honey, no brood lots of bees and no marked queen! So l hurried back to the house, 10 mile round trip. Brought 2 frames of brood and put them in hoping for a few q cells to harvest went back 13 days later. Lots of uncapped brood, no q cells? Then l opened the hive l took the brood from, 20 plus queen cells! The marked queen was on those frames of brood and the virgin either killed her then mated or the marked queen swarmed. That is why there was no capped brood in that hive