You are probably right about the drifting part. Naturally his own bees will check out the bait he has planted, and this has been on-going for Terri for at least 6 weeks. But he still may recover a swarm in this trap box as described in my last post. And it is 'not impossible' that his own bees will not choose it as well. As gww; Ive personally had it happen (though that was not my goal).
I for one, fully understand what you are saying beesnweeds to your point and credit. While Remembering the ongoing discussion, anticipation, and excitement of Father Michael a few years back when he was in almost the same spot as Terri. More than one of us tried to give him a heads up, in case they left, (which they did). I also remember the disappointment that he faced when they left the area, and the disappointment we felt for him.
The bees, more times than not, will leave in my experience. But we never know for sure what they will decide to do.
I also agree with you that it is better to save them the swarming experience by our good beekeeping methods.. (when possible)...
Phillip