Not a good deal, if someone sell you a license he must request a license transfer to your server IP. Scrapebox Staff does not allow any customer to transfer or sell their licenses to avoid frauds.

If someone sell you a license he can simple wait a few days and mail Scrapebox Support saying that his email was hacked and they will move the license back to the original owner (previous server IP).

That's my 2 cents. Buy from the special link with discount mentioned above.
This is the best way to don't get scammed : )