Drone laying queen or laying workers
If you have a drone laying queen you can find her and kill her then i would unite them.
If you have laying worker dont unite as they might kill your good queen.
No I did not catch the swarm I have 2 nucs with good queens would I be better of uniting these to the 2 bb if there is a vergin queen there could be trouble
One of my hives swarmed on 10th oct on 2 bb full of stores should 1 squeeze it down to 1 bb or just leave alone until spring i have not opened it as all my hive are locked down for winter