Even if he can find the key through software, if the COA isn't valid, it can't be refurbished with Windows (Legally). A 20GB SSD is worth around $20-30. I'd sell it, and get what you can. Now, takinig revenge with the COA issue is another story.
Was this a laptop with a COA on a door or removable panel? If so, I'd check to make sure the panel wasn't swapped. If it was, you may have a case there. If not, you're probably out of luck with eBay.
The good news is that if it's a slightly older model, selling it again with an SSD (Or selling the SSD separately) may yield you not too much of a loss.
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