After exactly fourteen days of worrying and waiting, my kitty finally was able to find his way home. He appeared magically out of nowhere shortly after I got home in the evening yesterday.
He rushed over to the food bowls and pushed the other two cats out of the way. I guess he was starving. Needless to say that we were both happy to see each other and were both relieved. He's currently sleeping all his past troubles away.
Thanks to all of you that helped out. I'm sure your contribution helped him find his way home.