I've got three girls who are 3mo. old and I am anxiously looking forward to eggs. I've read in various posts the suggestion to put ceramic eggs or golf balls in the nesting boxes to show them where to lay. Does this work? And if it does at what point should I put the fake eggs in there? Also, ceramic eggs are about $10 for a dozen, but all the sites I found them on then charge about $10 for shipping. Are golf balls just as effective? Thanks.