Set as many have-a-heart traps as you can near the edge of your home or the park. He will be out looking for food. NNN I believe have them to rent. Also contact every rescue in the area along with vets. Post picture of him at as places you can. Never when you will get any info. Trapped a cat in my yard that was missing for >3 months. Was within 3 blocks of his home. Recognized him from a poster on my block.