Hi all Newbie here, I was wondering if I can you use milk crates or wash tubs as nest boxes? Or do they need to be enclosed? They would be sitting under the poop boards against a wall, and is straw or wood shavings better for nest material? Also I have 3 RIR Mix I think!!! they are 21 wks , and NO EGGS yet, I search everyday when will it happen. Thanks Much