I'm super new to chicken keeping so I've got no real advice for you but I do hope they turn up safe and sound. Sunset is around 5 in my part of the world. Most of the time they are in the run by 3:30-4 but when they aren't I will use treats to get them back in before it gets dark and then they always go inside the coop at dusk before the magic auto door shuts them in for the night. Maybe some training to get them where they need to be? It's just what I do.
We are going to look again tomorrow in a larger radius, as well as reaching out to neighbors.