Let me get this right Sprogget. He bought a product that was not as described, got a refund so had not really purchased it at all, still has the product minus activation (the reason for refund) and you are asking us law abiding people to assist in getting it working. Correct?
Now that your nephew has his refund he can go out and buy a legitimate copy with activation can he not?
He could have got the copy without activation without going through the whole Amazon experience by downloading the trial version, essentially what he has now. The good news is that MS will provide the code, bad news is it costs, probably more than he would pay at Amazon or Play.com.