You're definitely starting to build trust by continuing to post here, that's for sure. As you said, most scammers would have run away once they figured out that people were on to them.
It sounds like you've bought a few games and had them shipped to your international buyer. From your response, which uses the word "we" and "our" quite a bit, I'm lead to believe that you're either a business that helps international buyers find games, or you've got a pretty good relationship with your buyer. Frankly, it's none of my business, but it does make me wonder why you don't just have the games shipped to you and then prep them for international shipment. I realize doing that would require paying two shipping costs, but it seems like it would avoid all kinds of misunderstanding and heartache as the deal would be totally transparent and you'd get the games prepped to your standard, which it sounds like most others are either unwilling or unable to do.
Ultimately, once I sell a game, I don't really care what you do with it. It's yours, you bought it. If you want to send it overseas, that's your choice. If you want to set it on fire, that's your choice (I really wouldn't want you to do that and I'd definitely think you'd lost your mind).
As far as creating multiple accounts, Robin (the website's founder/owner) actually has fairly sophisticated systems fro stopping people from doing what I mentioned (creating multiple accounts) in order to combat potential scamming/fraud.
At the end of the day, folks jumped to conclusions because many of the typical flags were present; new account, "odd" situation with being the middleman for an international buyer, suggesting a wire transfer for payment, etc. As it happens, it looks like you're the .1% that's actually legit. Hopefully, you'll be able to guy the games that your buyer wants and you'll have a long history here on Pinside.