Well, we did this a little different.
Our coop is *mostly* done. we have the doors on but not the windows, and we have the openings to the next boxes cut open, but still have to add the nest boxes to the outside of the coop.
We also don't have the run set up yet, but th egirls outgrew our brooder about a week ago and really needed to get outside.
So with the coop *mostly* done and *mostly* in position, I installed 1X1 wire mesh over the window and nest box openings, lined the floor of the coop with grass cuttings and moved the girls out. Through this week I'll install the windows and nest boxes, and get started on the run this weekend.
Without nest boxes to move into, the girls are mostly spending their time scratching in the grass, and huddles in a corner of the coop. So far I have caught one of them making use of the roost. I am hoping that this arrangement will give them time to figure out places to sleep that don't include the nest boxes, and that by the time I get the boxes in place, they will be used for their true purpose.
Edit to add - if we do find that the girls are using th enest boxes, I will simply put a rubbermaid in each one to fill it. Goodness knows we have enough storage containers around that we could move a few out there for a week or two and never know the difference.