Oh no! Not Miles! I don't want to imagine that boy out there on his own. If I'm in tears all these thousands of miles away, I can imagine how you are feeling. I wouldn't be getting any sleep either. Have you called all the shelters and vets in the area? As Lisa would say, check the shelters thoroughly. Take a friend so that it's easier for you. I don't know your ark well, have all the missing cats been outside cats before you adopted/rescued them?