We've been getting eggs for about a week now. However, I was a little late in getting the nest box built, As I was building it last week, three hens got up on this plastic bag full of shavings and laid eggs. So I built this box and put straw, shavings and golf balls in there, but the chickens seem to prefer laying on top of the plastic bag. I removed the plastic bag one day this week and got no eggs that day, so I put it back. We have been getting 2-3 eggs a day otherwise out of a flock of 16 hens. Should I just remove it entirely and see if they use the nest boxes? The spaces between the studs is 16" so my holes are about 12" is this too small? We have 5x cherry egger, 5x easter egger and 6x barred rock. I have to open a door on the run and another on the pen to collect eggs now. I sure wish they would use that box, it would make my life much easier. Thanks for any ideas!