Got a refurb iPhone 4 today--traded mine in because of a dead pixel. What I want to know is, is there official documentation anywhere from Apple saying what constitutes a refurb? I have heard a rumor that they keep the board from the inside, but put everything in a new housing (basically, the guts are re-used, and the outside is new). I looked on Apple's website for an explanation of what a refurb actually is, but didn't find much. Can anyone give a link to something?