Katie, you would be surprised by the people who feed cats or otherwise leave out food for animals. When Mysty went missing, I posted his lost pet flyers in several city hall buildings and rec centers. Someone who happened to see the flyer called me to report that he saw a grey tabby like Mysty eating some cat food in his back yard. His wife leaves cat food out for strays and ferals. This cat was very skittish and fast and sounded to me like more of a feral cat than Mysty, but you never know. I asked the man to call me if he ever saw the cat again and he never did.
I also called the owner of an archery club nearby. I just decided to call him because he sits on a large tract of land and he may have seen Mysty. His secretary told me that they've been feeding a stray or feral all black cat, but nobody has seen a grey cat. "And don't worry," he remarked, "if I see a grey cat in the woods, I won't shoot him." (nice!
Then there's my dear brother who puts out birdseed, squirrel chow, and scraps for wild birds, squirrels, skunks, etc.. He told me that recently two cats have been visiting his feeding grounds.
When I called the local animal shelters, I found out that they often get reports from people who have found cats (like Tina) and who are taking care of them until owners are found. I received many phone calls from the local animal shelters describing cats that may have been Mysty. As it turned out, none fit Mysty's description.
Try posting some flyers on main streets, hand them out to city hall and rec center workers, churches, schools, veterinarian offices, etc.. You can even try calling the local animal warden, police, and fire depts, supermarkets, shopping centers, churches, schools, gas stations, or any place where your cat may be found. Hungry, lost cats may seek the comfort of buildings such as supermarkets, gas stations, and grocery stores.
Good luck in finding your kitten!