i have picked up a couple that have done that. one lady has a swarm land in the same tree almost every year. i don't know if it's scent, genetic memory, or what. now i always tell people to keep my number. you never know.....
also took a swarm and had the guy call me back a few days later to tell me i missed the queen and a small clump of bees were back. i knew i had her and the bees. i figure this was an afterswarm maybe led by the same scout bees? they are interesting critters.