Sony :: Black Carbon Fibre Or Black Plastic Lid Of My New Z

I just got a brand new customized Sony VGN-Z890FKB. The sales representative of the website where I bought it from, states all their models come with the Premium Carbon Fibre lid, however I find it very hard to tell the difference between the two.

Nowhere it is indicated that this one has the carbon fibre lid. On the side of the box it says B (Black) so I got confused.

The lid is black indeed, if I look close enough I see small silverish specs mixed with the black, even on the bottom side of the laptop. The palmrest/keyboard area is a darker black without silverish specs in it.

A friend of mine has a Sony SZ and there you can tell it is a black Carbon Fibre lid (black with a hint of purple in it - when you angle the laptop from one light source to the other + you somewhat see horizontal lines on the lid of the Sony SZ).
Also if you look carefully on the sonystyle site, you see those same horizontal-like lines on the Carbon Fibre Black lid of the Sony Z contrary to the Black plastic lid.

How can one tell whether his Sony laptop has a carbon fibre or black plastic lid?