[Cleo C. Hogan Jr]

Swarms seem very large until they settle and start to work. Unless it it indeed a very, very, large swarm, 2-10 frame mediums will give a lot of room. If you are using foundation, I would say no problem, but, if you are using drawn comb, I would not add a third. The bees need to cover all the frames.

Bottom line, I would not open the hive for three or four days, let them settle and go to work. Then decide if they are crowded.

cchoganjr

 

[Cleo C. Hogan Jr]

I would simply bounce them off the inner cover, into the two mediums below, remove the empty box, and leave them alone for a week.

cchoganjr

 

[Cleo C. Hogan Jr]

Nothing wrong with filling it with frames, just don't leave it vacant, as they will likely start building their own comb off the inner cover. Bounce them down into the two bottom, then fill with frames, Then leave them alone for a week, then if you see they are only in the bottom two, you can remove the third, or manipulate the frames so that they are in the bottom two mediums. If they need three, leave it on.

cchoganjr