It seems some users, including Randall25, over at the NotebookReview forums are in an uproar regarding Sony and the carbon fiber option on the VGN-SZ160p/c laptops.
If your unit has VGN-SZ160P above the left hinge and the lid does not have a criss-crossed weave pattern, then it's plastic.
The thread on the forum is chock full of carbon fiber experts who put in their own two cents, but we are still waiting on an official word from Sony. What's that smell? Oh yeah, lawsuit!
All SZ160p/c owners must read this! [NotebookReview Forums]