We just set up our nesting boxes this past weekend as our hens are about 19 weeks old now and we wanted to be prepared. We screwed the boxes into the wall and filled them with straw and a couple golf balls each. Well, I went out a couple hours later and the girls scratched all the straw out of the boxes. How can I prevent them from doing this and encourage them to use the boxes for what they are for? Thanks for your help!