Often, kitties don't roam very far, unlike dogs....they will hole up & hide, not responding to calls from owner. I would walk your couple blocks every day, when not alot of traffic or sounds, calling & then listening, over & over. Don't feel silly, your cat may not answer , especially now, til you really move him with your voice. Listen carefully for the little tentative meow, near garages, fences, shrubbery & buildings- anywhere he could be hiding. Best wishesMy Theo was gone for 4 days , & I kept walking the whole block, calling him...4th day, block behind, his head popped up out of a flower pot on someone's porch. I had been by there calling at least a dozen times!