Good protocol is to leave the box at the collection site with the swarm inside (and entrance open or QX) until dark - when scouts etc should have all returned to rejoin the cluster inside the hive. If Q is not in the box, the bees won't stay inside and will very quickly (in minutes) rejoin Q in the tree or wherever. And you have to try again to get her ...
Hey, c'mon, I made no such "assumption"!...
It is, however, making an assumption that this is what's happened in this instance. We don't know if the swarm was 'collected', or if it 'caught' means it arrived on its' own.
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You didn't mention if the swarm was collected miles from where they are now (or when you might have moved them).
If they were moved, one possibility is that Q was left behind, and there is no Q in the box or under it.
Good protocol is to leave the box at the collection site ...
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