I added my sparrow spooker on Tuesday. It took the mother bird 45 minutes to go in the house and dad 1 1/2 hours. I haven’t seem them at all since then although the eggs are fine. They are some of the sneakiest bluebirds I’ve ever seen though. I thought once they went in everything would be ok. Should I maybe put some grass in the hole to see if she is going in and out?