I'm not sure if you're in a place where this would do much good, but if it were my cat, after 3 days I would be making flyers with his picture and your contact info to put in neighbor's mailboxes and post in visible spots. It might also be worth calling your local animal shelter to see if they have any new arrivals that match Williams' description.

Anyway.... Solidarity from a fellow cat lover. :heart-sickle: