So, yay. He was reunited with his grateful owner(s).
But not before he made himself at home in my house. I had to let him inside for a few minutes before his peeps came to claim him; apparently Poopsie has "mad ups" and can jump over our fence somehow--I discovered this by answering a gentle rapping at the garage entry door, and there he was, despite my having secured all backyard exits! ("Tis the wind, and nothing more!" -Poopsie)
Oh, and Poopsie's real name is Sly. Like a fox.
Somehow, I doubt this is the last we'll see of Sly.