Re: How to? Swarm just went in
Assuming the story is correct and they just went in there would not be any honey stored yet. Drilling a hole in the drywall at the bottom and injecting a little smoke should drive them out. The queen can still fly but if you wait and she starts laying she can't fly. Having a box with honey and LGO nearby should be a good prospect for them. I am not sure how the brood will work because it will have the smell of another queen. It will keep the swarm there once the bees and the queen decide to go in.
Zone 5a, Practicing non-intervention beekeeping