Today I converted the cardboard box that my nuc came in into a swarm collection box. I put a frame with foundation in the middle to give the swarm something to crawl around on, and on the top of the box I added four bee escapes, which are basically one-way valves for bees. Bees can go in the box, but they cannot get back out. In theory, I can shake a swarm into the box and put the lid on it. Any bees from the swarm that did not go in the box immediately will eventually go in through the bee escapes, so long as the queen is in the box. I reinforced everything with duct tape, which makes the box more durable and water resistant.
