@ElGravis:
Defy question? No. In the first place, you have been making mocking statements in your first post by implying we support scammers. You wanted to ask for help from a human being (not a robot, just to be clear) by opening your statement with a mocking remark, then when I answer back, you question why my answer is such. But regardless, we're only going to make this long, the short answer is no, we don't support scammers of course.
If the email was indeed changed by GW2, my rhetoric is that why is the buyer complaining he lost access to it, and why did you not assist in getting back the account for him? I'm not asking this to be sarcastic or anything, but because this is the idea our agent banked on, because we always need sellers to assist buyers. You should recover the account by contacting GW2 and providing them the recovery information. The fact that you can't (or won't) recover it means the account is not in a recoverable state and this means the account should not be sold at PlayerAuctions. As per your question: "what if he lied, what if he did not lose the account?", then recovering the account for him is a good opportunity for you to prove that, that the account was still accessible and he was at fault. You did not assist your buyer in your order, so I'm afraid the decision is made in favor of the buyer.
I really tried to help with this but I'm afraid our team's decision supersedes mine on this matter. As I've said, the decision is final. You should recover back the account so you can re-sell it.
I'm sorry but I have nothing else to contribute to your case, ElGravis.