Guys, this is the internet, you can't take a "word" for granted.
In order to avoid scamming there are a few steps to have in mind:
1 - Do a background check on the player forum account, people who can vouch, etc;
2 - Always ask for a safeguard item or currency in return, always!
If he can't comply on the 2) terms, it's his problem, at least you won't get scammed, try to find a new trader/seller.