well.. 400 feet is kind of a long way I suppose...
so maybe if you only let them out for a couple of hours at first just before dusk, they won't get the chance to travel that far. It's not like I think they'll get out of the new coop and head straight for the old one, I'm sure they won't. But...
I think it's a toss-up.
They might... they might not.
When I move my birds to a new coop, I just let that coop door stay open for the first couple days, so when they start wandering toward their old coop or pacing in front of the door, I can just herd them into the new one. Usually takes 2...