... The nuc was instpected a few days ago and I heard a queen piping through her cell. ...
"A few days" is long enough for the princess to become flight-worthy.
If the cloud of bees returned to their own hive, bearded on the outside, fanning - and then made their way back inside ... then it could indeed be a mating flight.
On the other hand, if the cloud of bees headed off into the middle distance that would be a cast.
My personal suspicion is that, at least sometimes, many of the bees don't actually know what is happening. Which may be why they could mistake a mating flight for a departure, and go along with the excitement.
This happened to me only a couple of days ago. Having left one queen cell to hatch, and keeping my fingers crossed I didn't expect to get a 'your bees are swarming' call. I got there 10 minutes later to see a few hundred bees flying around nearby bushes looking a little confused and the rest returning to the hive. I inspected the next day and for the first time heard the queen piping . I found her on one of the outer frames. Very skittish so I closed up fairly quickly. Now I wait for the pollen being taken in and will inspect again in three weeks.
It was a swarm. They were unreachable too. Still learned a few things from this thread so it was worth posting. Thanks
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