BEWARE : Due to the new policy:
https://bitcointalk.org/index.php?topic=2282758.0 ,The seller can lock the account he sold up to 14 days after the change of the email address
So if you buy hacked account,the real owner can recover it !
The seller can Also recover the account after the sale !
If you want to make a deal : USE ESCROW, get the account with his email address, change the email and be sure you get a Notification to the old email address ! After that, release fund to the seller
A seller who doesn't want to use escrow is ALWAYS A SCAMMER !