Click for more pictures of the real Slim
The fake is the one on the right. To put a fine point on it, cakefoo totally nailed it, to the point that we're wondering if he had the real thing on his desk as a reference. To put an even finer point on it, the logo is slightly bigger on the mockup, so it totally doesn't look anything like the real one.
It's also really close to the early box image we saw -- but we can probably attribute that less to a prescient/detail-oriented Photoshopper and more to this box image probably being real. In fact, this box image and the in-production shell image were probably among the references used by cakefoo.