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Your roosts need to be higher than your nestboxes. A chicken naturally wants to go as high as possible to roost at night. If your nestboxes are higher, guess which they are going to choose.
Sometimes if they are already in the habit of sleeping in the nests, its necessary to go out to the coop at night and move them to the roosts. Use as little light as possible to do this, so they don't get up and start moving around. I use a penlight when I have to go to the coop at night.
Provide fresh bedding and fake eggs in the nests; golf balls will work. Collect any eggs you get as quickly as possible, to discourage egg eating which is a habit that is difficult if not impossible to break.
Finally, if you just got them they may not have settled in well enough to start laying again. It takes them awhile to get comfortable with new surroundings.