I'm pretty sure that picture wasn't taken with a camera. It looks like a scan...
Another thing to note (on top of all the other evidence), from what I can find, industrial models didn't seem to come with a grey logo (except for the M13 where the grey logo was a different shade than the case, and from the pictures I can find, were only ever made after the change to the blue text version of the logo).
Plus, (even in a black and white photo, which I'm not convinced this isn't) the led indicator panel would appear lighter than the rest of the keyboard, not darker.
But, I'm not saying anything anyone here didn't already know. I just feel sorry for the people paying industrial prices for a lightly/unused M.
Also, it was in SHRINKWRAP!?! "For years"? I hate seeing sellers on eBay do this, but one sitting around like that? The top and bottom row of keys are probably in need of some work.
The poor soul who opens the box when this thing gets home and realizes what he's paid for...