It's a long shot but I just found and trapped a male black cat in Elyria, oh. Is an adult male cat, friendly, a little on the smaller side though and Mr. Big sounds like he was probably big. Just making contact with all missing black male cats just in case his family is out there. This cat is extremely domesticated.
Bianca Ryder Sadly, I have not found him. I post him as 'still missing' because who knows (?) someone may see him and recognize him as the lovable stray they've taken in. It's distressing to not know. Thanks for asking!!