Did they go outside at the breeders?
Do they have to navigate steps or a steep pophole access to get out from the house?
Is there something which might be frightening them - a dog, say - which they can see near their house?
Where are they fed and watered, inside or out?
As you have had them for just a few days, give them more time to get used to their new home. Once they have had time to settle in, try giving them a little grain treat outside in the afternoon.
They sound to me like birds which are not used to going outside at all, so they are bound to take longer before they are happy to go out than pullets which are already free ranging.