I brought home some young quail and it took them a few weeks to settle in. The next group I brought in settled in more quickly. If they were laying before, it is likely to resume. Are they all in the same cage? You may want to put them in separate cages if the males are fighting with each other or going after the females too much, which could be adding stress. I tried 2 males with 9 females and that did not go well at all. I ended up buying another cage so I could separate them, and everyone was much happier. We have also had one aggressive hen. I ended up having to mover her to a different cage, rather than moving the one she was picking on (because then the aggressive hen picked on any new ones). By making the aggressive hen the new one in another cage, there hasn't been any more problems.
Good Luck.