I always get my chickens back inside with treats. I've also taught them to come when I call, "Yummies!" They know they're getting treats when I say that, so they all come running no matter where they are. It took me a while to teach them that, so it's not something you can just do, but it might...
As the others have said, I can tell they are BRs by the clean, even barring, the single combs, and the yellow legs, as well as just general body shape.