Good luck!
We had a similer experiance (only my ditzy mom just all the new birds out). Of 25 birds we got 19 back. The best trick was to go out a night with a pole and a flashlight--if you can't sneak up and grab them, knock em off and they are so much easier to catch than in the day. The last 3 came back of there own accord to try to get in the fence with the others. We have the normal preditors here (I could hear the coyoties going crazy two nights after they ran), but many roosted high up and lived on their own for a few days before being caugth or disappearing.