Most rescuers will think that a cat is abandoned or stray rather than lost and wanted. It's critical to microchip your indoor cat - he may eventually be taken to a vet, scanned and you will be notified. Communicate that your pet is lost not stray:
Poster your neighborhood
Place ads in local papers
Speak to people who are out an about in your neighborhood (e.g. mail carrier, lawn service, kids, dog walkers)