You may have a queen or no queen. If you have a queen you should see pollen moving in soon. If they are queenless, they wont have anything to make a new queen with, so if you give it a few more days and have a look for single eggs at the bottom of the cells then you should be ok. If not I would be tempted to put a frame of eggs larva and nurse bees out of your existing hive in with them so that they have larva/eggs to requeen themselves with.
It seems that it is quite a small swarm and perhaps a full 10 or 8 Frame deep is too much for them to look after. I would be inclined to reduce the number of frames to the point where there are bees on all frames.. 2 or 3 frames might be the way to go. Increase the number of frames only when there are a sufficient number of bees to cover the new frame/s.
By the way, whereabouts are you located??