There are QR code stickers on the front of new units.
Which encode..what? I mean, technically some of the older ones had 'a barcode' as well, but that was just a datamatrix format of the serial number.
Edit: Found some shots of the front stickers - looks like it's the same thing, probably to make scanning easier on their end. Does little for retail, though;
back side, scans easily, should result in the serial #.
front side, barely scans but you can see they're the same.