One week ago I decided to put up a five frame nuc as a trap in one of my away yards. Only put one frame inside with old comb and used a q-tip to smear a little lemongrass oil inside and then dropped the q-tip inside. I took this box and nailed it about 7ft up on a hickory tree 50 ft from the hives. Yesterday the landowner called to tell me of a huge swarm about 40ft up that had been there since the day before. I decided to stop by and take a look. (It was HUGE) When I got out of my truck the swarm took flight and headed straight for the swarm trap. I was amazed that such a large swarm would enter that small box. When I left there was more bees under the box than I thought the box would hold. Decided to fetch a regular deep box to put these bees in. When I returned late in the afternoon I was surprised to find all the bees had moved in. I took the top off and that box was packed fulllll.. I put them into the deep and they filled it full.. probably will need another box. Amazing to me that huge swarm would move into a box that small. Now, I am a believer in swarm traps as this was my first.