If they were started in late June, chances are, all there is left are older bees and no nurse/house bees. While foragers can take over the roles, they do a poor job of it because their digestive tracks no longer work.
i hate to say rob Peter to pay Paul (and if you have hive that are doing good) but you might want to try a frame of open brood (the smaller the patch the better) and a shake or two of bees at the entrance to give them a kick in the butt and also might stimulate the queens to start laying.