This sounds morbid, but post lost kitty posters at the nearest cemetary. Uncle is caretaker at a near by cemetery, always finding strays. That is how he wound up 'Tinny', she was hiding in bushes. She was terrified, but with alot of love and some tuna/ sardines. She was able to find a soft place to lay her head down. Uncle search CL, local papers, laundry mat bulletin boards, trying to find her owner. No luck, so she came home with him. Tinny, Black Beauty and Frosty are the indoor kitties at the farm.
Add some prayer to St. Francis the Oliver come home soon.