I bought a trio of Khaki Campbells recently (aged over 6 months). I treated their home coming just as I did with my hens e.g. keep them confined to "home" for the first few days so they can de-stress and get used to their surroundings. I then let them out for the final hour of daylight and dh and I gently "herded" them back home. The next night, they found their own way to their home. So, the next morning, they were given FR access and were locked in their pen when *they* decided to go back.
Because we have urban foxes, we don't FR them when we are not around (same as my hens); but, when we are home, we are outside with them all the time (great for us; great for them).
Good luck with your chicks!!