Seen it before, tested.
the problems is everyone who say "You are a noob! Just go check the AH!"
And you said:
"when you arrange to meet up, say "Hang on I'll just go get some money from my main" then don't come back on and WOLAH! Your main should have mail saying you have money waiting, this may not work sometimes but, well that's the risk"
It's better to just tell the guy who bought yours that you already got another guy who sold it to you.
Then he can't report you.