My hens are still probably a few weeks or more out from laying their first egg. I got them the last week of May, so they're approximately 16 weeks old. We have one of those raised coops with 3 nest boxes that are about 2 feet off the floor. When we first put the hens in the coop at about 6 weeks of age, they tended to sleep in the nest boxes and were pooping in them. So we cleaned them out and put a piece of plywood in front to keep them out until they're ready to lay. They are now roosting on the 2 branches we have, which took them a while to get used to. When should I remove the wood that is covering the nest boxes? I don't want them deciding to go in there and start pooping again, but I also want it accessible for when they do start laying. Thanks.