After a few days of being 'lost' Clem showed up at the door at 4:00 am early Wed. morning. He was a little skittish but soon was back to his old self. Thank you to all for the suggestions. They seemed to work... putting some of our dirty laundry and cat litter box outside, calling out his name (especially at night when it's quiet). Not sure where he went but hopefully he learned his lesson and wont do it again. Thank you all once again for your care, concerns, and suggestions.