Look around to see if they have not found a hiding place. One of my girls squeezed between my shed and a chain link fence and had layed 11 eggs and was roosting. I even hosed her with water and she refused to move. I had to go around the block and take a bolt cutter to cut a small hole in the fence big enough for my hand to reach thru to get the eggs. These girls are so spoiled . For breakfast my 4 girls and 3 ducks get chopped lettuce , tomatoes, cucumber, celery every day. They started to lay at about 5 or 6 months and at 8 1/2 months I still get 4 eggs every day. I am in CA and last night we had frost on car. Coldest night this year. And they have a coop heater that is always on.