I'm really sorry to hear Tiggz hasn't returned. Keep hoping!
We had a field behind our house too, we checked but he wasn't there, we have plenty of stray cats in this area though, I see about 5 different cats outside my window everyday, I hope he's safe somewhere..This is just heartbreaking!
When I was little, the same thing happened to us. We moved and she bolted.....it took us a week but we found her way back in a field behind our new house.....she was wet, cold and hungry but she was thankful to see us!