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He can say that it costs him £200 to send it, but he won't have proof.
Copying and selling CDs is illegal.
Plus selling XP Service Pack 2 is also illegal.
If you were selling XP SP2 you could only charge the cost of the CD, you can't sell the software.
That pretty much covers his back.
I'll give you £2 for one - but not on eBay.