We bought 4 hybrid chickens 5 weeks ago. 1 has been laying daily since week 2 (pretty certain it's always the same one) but nothing yet from the other 3. They were sold as point of lay pullets and we we're told they were a week or two off laying age. They free range in the garden so it's not impossible that they've found a quiet spot elsewhere to lay but I have checked all the places that they seem to hang out and found nothing. The one who does lay always does so in the nesting box. Any advice/thought/experience?