Swarm cells found during cutouts are a good thing, IMHO. They are insurance that even if I miss the queen, I've got rapid backup on the way.
The cutout tramatizes the hive and should put an end to swarming urgest, right? I was thinking about this the other day after I remove a hive just about to swarm. Is there any risk that as the swarm cells hatch in the new cutout box that they might swarm? Or does the dominant queen do in the unlucky foes in a dastardly fashion? Any chance hatching queens might provoke swarming?