Hatchery chicks, no mom. If I remember right they were around eight weeks. If they have imprinted on the coop as home they will return. since they have been out there for two weeks they have done so. You could leave them out in the evening at first, so they won't wander far. That will let...
Growing up on the farm the pullets were left to wander and often they had a corn field next to their coop. Never knew one to get lost and die of starvation.