There are many iPod fakes, but none as ruztynail mentioned, has come close to the real thing, especially the click wheel. And you can judge from the quality and design of the box, as well as the UI of the iPod itself.

The fakes are mostly Shuffle and nanos. No video equivalent so far.

If you are not sure, ask him for the serial number and you can actually check this online at Apple Support. Hope this helps