Checked a hive two weeks ago. Lots of bees, but too many drones and no eggs or larva. Checked it again last weekend. Even more drones and no eggs or larva, so I added a frame of eggs. Checked that frame today for queen cells. SURPRISE! Instead of cells, I found eggs and new larva. No signs of swarming. No signs of queen cells. Nothing to give a clue that anything happened other than a lost queen. Very sneaky, for sure. They never cease to amaze me.