If they were laying before you got them then its the stress from moving them, especially if you changed their food,bedding etc.
Its hard for them just being in a new place but if alot of things are different from their previous home then its a little more stressful for them.
If they were laying, it could be a combo of the move and and the change in the amount of light they get, with it getting darker earlier.
Its also a possibility that they haven't started laying yet and they will, but with the days getting shorter it may take longer than usual.
Good luck, enjoy your gift.