Are they already laying eggs? If not they won't have a reqson to go in the nest box. As for the roost, is it new to them? Mine sometimes take a while before they roost and prefer to sleep on the ground. Tou xan begin training them. Once they bed down for the night go out and place each of them on the roost. Use a red or dim light.
Do you have fake eggs in the nesting boxes? It makes them curious , I watch mine turn over the fake eggs then lay their own beside them.
It’s true what @RollTideChicken says , I’m training my 25 pullets every night at dust with a night light on , I’m down to 3-4 still needing help after 12 days ...
Something new for my resume
Have fun with your chickies
If they're not close to laying there's no reason for them to be in the nest box, so don't worry about that - better that they not go into them at all right now.
As far as roosting that's something they have to learn, either from older birds or from you. If you pick them up and put them on the roost at night they should start getting the hang of it soon.
Let's get the terminology straight.Our chicks will be 17 weeks old and they will not go inside the nesting box also we have stuff so they can roost but they just want to cuddle on the ground. Is this normal or am I not doing something right?