I have good news: Kitty Galileo has been returned to us!
We were just about to go out to do more leafletting and postering. I stopped to visit the bathroom. Good thing I did! Someone banged on the door. It was a man with Kitty Galileo in hand.
He'd apparently seen Galileo previously a few days ago, but hadn't yet seen one of my posters. He saw a poster at his mother's (or maybe mother-in-law's?) who is in sheltered accommodation across from us. It was one of the posters from Sunday afternoon that had our address on it. He was on his way today to visit his mother/MIL and saw the kitten again. This time he scooped the kitten up, praying it wasn't someone else's, popped Galileo in his van, and came right over.
We're so glad. He wouldn't even take a reward. Heck, we didn't even catch his name, although we know the unit number of his mother/MIL and her name. We'll see if we can figure out which building for sure and we'll definitely be giving her at least some flowers for raising her son right!
Kitty Galileo didn't seem particularly hungry. He has eaten and has some water, but he wasn't ravenous. He basically looks OK, except for possibly a bit of an eye infection/eye irritation. His lids look kind of pink to me. We're taking him to the vet's tomorrow to be checked over. Other than that, he doesn't seem any worse for the wear.
We're celebrating with Thai food for us, DentaBits (AKA Kitty Crack) for the cats, and an evening spent notifying all the vets, shelters, forums, registries, etc. I'll probably make up a "Galileo Is Home" poster and post that in place of the "Lost" poster tomorrow so people know he's been found.
Thanks, everyone, for your support!