Help Find Sweetheart: Missing Calico Cat

This is Sweetheart. He was taken from his owner while he was at work. We are thinking Sweetheart may have been taken to a humane society or a vet clinic.. Not sure. His owner wants him back and is desperate to get him back. I'm here to help look and will not give up till Seeetheart is back home. I think he is 2 years old has markings kind of like a calico with tan spot under nose. He was taken yesterday Oct 1st along with his toys and litter box. This is so sad and cruel and I'll do whatever it takes to get Sweetheart and owner back together.