Is there something we can do to make sure the girls know to use the nesting boxes? We have 6 hens, no roosters. We put a perch in front of the nesting boxes so they could see in there and thinking they'd be able to get into them easier. Should we put a ramp in? How on earth do they know that's where we want them to lay eggs? We put a fake egg in each box too?! Are chickens really that smart? There 16 weeks old now, so we hope soon they'll start laying! Any thoughts/advice appreciated!