Don't give up!! Keep searching! I hope he comes home soon. Growing up we had a cat that would eat dinner at our house and then run the the neighbors for a second course, sometimes he would stay there for days! (Cats are SO smart!) They didn't know he was ours and we didn't know about his second family, we just wondered how he got so FAT!
I will pray for Tiger to get his cute little fanny back home where he belongs!