A Macforums member bought an "as-is" Macbook Air from Ebay and the unit ended up being an early Air prototype. The computer bears a mark indicating it was built in May 2007, six months before the line was introduced.

There are a few changes from the final design: The microphone positioning is a bit off, the keyboard has no lighting, and it runs an interim build of OS X 10.5. The bottom, as shown in the photo above, is black-colored aluminum. Apple has offered no word as to how the prototype unit escaped their clutches.