RETAILER FINDS DETECTIVE COMICS #27
It’s the classic story that any comic book fan or shop owner wants to be a part of someday: A person, cleaning out some old stuff in a house finds a comic book. Well, not just any comic book, but a copy of one of the handful of the comic books.
http://forum.newsarama.com/showthread.php?t=132273

Hey, I have 4 of those, you mean they are worth something

Holy crap. You go through a million "I-found-these-in-my-attic" collections but you never really expect to find anything cool... much less something like this!