telling ya, check craigslist. put up flyers.
a buddy of mine's cat walked out of his 3rd floor apartment one day he had a party. some idiot left the door open when he went outside for a cig. these cats are indoor cats, always lived in the apartment, they wouldn't make it outside... it was SUPER cold too...
the cat didn't turn up for 2 weeks. he put up flyers and the cat had been staying at some lady's house who owned cats and didn't want that one taken to the pound... it might be at some neighbors house.... put up the flyers, check craigslist, but most importantly microchip it... that way you don't even need to keep a tag on it... at the ASPCA it's only like 30 bucks....