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He purchased on FB
Just playing devil's advocate here, but wtf did he expect when trading via a platform which is pretty much the sine qua non of deception? What price did he pay, and at what proportion of the £299.99 RRP do you think an offer is so obviously too good to be true that a reasonable person would know that it must be counterfeit?
Of course, he'll get his money back from PayPal, and I have no sympathy with the seller, but that doesn't make your mate any less of a bell end unless he takes a long hard look at his gullibility and learns to be a bit sharper in future.
Yes. See https://www.lfgss.com/comments/14520388/incontext et seq. The real ones don't have a transverse reinforcing rib connecting the two aft rail anchor points.