Usually I use hay, but I had some shavings left over and thought I'd put some in their nesting boxes. First day they laid outside their boxes (in a milk crate with nothing in it) so I put their eggs in the nesting box they use the most and put my most frequent layer in the box with the eggs. 2nd day they nested on the floor of their coop instead, so I switched out the eggs and put them back in the box. Today they nested on the floor again. Do I just give in and go back to hay or stick with it?