Sorry, this is BS...
Why would you sent your brand new retail chip to someone who asked you to RMA his OEM chip, which can't be RMAed in standard way? You just wanted to help? Really? I wouldn't do that for my best friend, cos then I would loose alot of money, unless I'd certain I will be able to RMA to OEM one.
Also, why would you ship 350$ or how much hardware via crap post service without tracking and insurance? Sorry but this one is most common scammer's bs they use...
I dun know you but I though PRO guys are cool, at least for bussines...