I'll check at my nearby tractor supply to see if there are any ( chicken safe ) bug killers for mites etc. I see no indication that there are rats/ snakes other pests. The bottom of the coop (hen house) has 1/2 in hardware clothe buried about 12 inches completely surrounding it. I have found a few broken egg shells and the chickens are staying in their house just moved out of the nesting boxes to the floor.

their laying boxes are about 13 inches square, 3 feet off the ground with a perch in front . I put about 3-4 inches deep wood shavings in them for bedding.