Yay!
I went through this a few years ago with my older cat on a cold week in December. He went out on the enclosed porch late one night and made himself scarce, so I closed the front door, figured he'd be scratching to get in within a few minutes. He didn't, and I went to bed, having forgotten he was out there. He must've skipped out when the paperboy came the next morning.
Went through a hellacious week, calling the shelter and putting up signs in the neighborhood. No luck. Meanwhile, my stepson came home with a kitty his friend wasn't allowed to keep, and we reluctantly agreed to take him in (even though he was such a leaper he broke something every day the first month we had him).
Well, about a week later, the kid heads out the front door to school, and there's the long-lost feline, looking none the worse for wear after what we feared was a week lost in the cold and snow. Somebody probably took him in, but his ungodly squeal and penchant for humping human forearms wore out his welcome elsewhere.
We're a three-cat household now, but have managed to avoid further disaster. They've gotten out a time or two, and the young one has bolted for a few hours at a time. The little one allows itself to be picked up without a fight. The old one, though...one time it got into the neighbor's yard after the kid left a door open. It squealed like it wanted to be picked up and taken back in, but he bit, clawed and scratched up my hands pretty badly on the way into the house. Love the horny, tempermental ***** anyway.