I run 4 foundationless frames with wires and 1 drawn brood comb. I leave them at least a week to settle before I move them. This gives them time to draw comb down to the wires and for the queen to start layinghttps://youtu.be/92EgotwfZCA
Other than the swarms that I've seen at my neighbor's, I've only seen a couple in all my years. I was unaware that they are all this common.
Left to their own most colonies swarm most years. Some colonies swarm multiple times per year.
It is really easy to miss seeing a swarm. If you are not near the hive when they leave(15-20 min.) or when they are landing on or leaving their temporary stop(again about 15 min.), you may not notice anything at all. Also it only takes a few minutes for them to disappear into their new home.