A raccoon raided our urban chicken run, and sent them flying everywhere. We found one 3 days later in a tree a block away from home, being fed by a friendly neighbor, after we had given her up for dead. She has lots of missing and broken feathers, but no broken skin! Dupel is still very freaked out and will hardly leave the coop except to eat, although she walks/flies fine. Hasn't laid an egg since either, but appears to now be going into full molt. I wonder if the trauma triggered the molt, or if it is just random timing.
Anyway, wherever those hens came from, they are lucky to have you rescue them. They look like a sweet bunch that will give you a colorful bunch of eggs. Good luck!