Is he home yet? He's so precious I wonder if someone has him. So keep up with Laura Jean advice.
She's a great cat person. Keep calling him from home
Check your shelters in person and keep fliers going. You may want to add a small reward. If you have any kids in your neighborhood they can be a good source of info. Don't give up on him! He's still out there.
Make sure to check in the area he roams where he could be trapped. Happens most often especially in cold months to outdoor access cats. Sheds, vacant homes, crawl spaces, homes under renovation etc. Anything that opens and closes.