maybe you don't have the roosts the right place for yours. Mine started as babies, and nobody showed them! The roosts should be so they can get up to them, above the nest boxes. I have 2 ramps, on 2 sides {it's just how mine are} going up to the main roost. Then they spread out to where they like.
People's chickens on this thread that they think won't roost, aren't realizing they WILL when they get old enough and decide to! I never put mine up on the roosts. They one night decided that what roosts are for. Chickens have been being chickens, longer than we all have had them. Lol..
They're only 9 weeks old. Let them be chickens! Don't bother them anymore. They're young and when they're ready, THEY will decide it's time to do as they should. Like I said. Do what I said over and over. I had one pullets, early on get into the nest and sleep. I left her alone and she decided...
If you'd just try what I said {above}, you may get better results. Scaring them out of the nests may give you problems later on. When I stopped worrying about my girls doing as I want them to do, they decided to do it. Just don't bother them and see. Give it time!
And please get those soccer...
Clean all the nest boxes and try clean straw in them, and ADD a golf ball in each nest! They may get the idea. Keep doing it over and over. I thought mine would never roost and now they're up on the roosts before dark, waiting for me to come shut the chicken door for the night.