We finally know some more about the story behind the original iPhone 4 leak. A lot more actually as the search warrant affidavit has now been unsealed and anyone can read it through to get the whole story.
Two things; first, Gizmodo was unable to take the phone apart correctly and broke it, which is unforgivable. Second, the seller's roommate ratted. Actually, the seller tried to plug the iPhone into his roommate's computer. She got scared that Apple would find out so went directly to them to absolve herself. So next time you find a prototype of the next iPhone, remember, you can't trust anybody.
Or if you're busy, Philip Elmer-DeWitt from Fortune took the time to put together a great 10-point resume of the document (link).