Trading crossfire accounts is NOT SAFE AT ALL.
I just thought of something,
Coulden't a person stay logged in an account when they give you all the info and you change the e-mail.
They could just stay logged on z8 and use the security they gave you, change the e-mail. Request the new password, And boom they got cash + account.
I say do all trades through teamviewer and make sure the seller is logged off.