I would talk to them one on one & explain to them that there's no free lunch here so start laying. Also, show them where to lay the eggs. LOL> Mine didn't lay till they were 25 weeks. Are their combs & wattles big & red. They are also in a new environment. They will start squatting when they are about to lay. Give them time they will lay when their ready is the best advice. Be patient. Do you have the boxes set up for them? I would add some fake eggs in the boxes so they know where to lay.
Also, if you just got them, do you know if they were laying before you got them? If so, they received stress in their move, and will start again when they feel 'at home'. If you love them and they have adequate housing and food and water and room, they will eventually lay. Mine are almost 20 weeks - I ask them every day, "where are my brown eggs?"