First time beekeeper. Twelve days ago I added a second brood box to my hive. Upon inspection today I found five queen cells with larvee and three with emerging queens. One queen emerged upon removal and climbed into hive. I also found a baby queen on one frame. I did not spot our mature queen. There were no eggs or larvee but there was newly capped brood. I am not sure what exactly happened and I am also not sure how to move forward. Advice?