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Not sure if this is the one you are talking about, but a cursory image search on Google led me to this image in a Flickr set: http://www.flickr.com/photos/mrbee2828/92718344/

I don't see the '@' anywhere which leads me to believe this may be a fake/photoshop. Still, quite interesting... :)

In your picture it would be covered by the license plate frame.

That's not the design I remember -like I said, it has changed- but it does look like a similar vehicle. Maybe they got a new license plate?