I got a swarm about 3 to 4 weeks ago in my backyard. It had 3? queens in it. I didn't know it was multiqueened until I looked a day after boxing it. The bees were balled tightly into 3 balls in different places in the box. I figured it was multi queened, so i poked thru one of the balls and sure enough they were keeping a qeen in there. I tried to cage her but she kept going back into the ball. Then when I kept after her, she flew off. The other 2 balls I just left alone. A week later, I had one laying queen in the box. I've heard and now witnessed that there are swarms with multiple queens in the fall of the year.
Living in 95901 area code near Marysville, CA