You almost had a hive. Sounds like your trap was in their top couple of choices. I found that 5 frame deep nuc boxes stacked double deep worked best for me for traps. I'd put one frame of old comb in the top, with 4 frames having only starter strips of foundation on them. Don't put full sheets of foundation in the traps, it blocks space.

There is a lure named Swarm Commander, that you put in the traps. It absolutely works.