Please let me get this straight? Did you posted here on vBulletin.org and did you get in contact with this guy on vBulletin.org? If not, then vBulletin.org is not the place to complain. You will need to complain where the contact was made or the transaction took place.
If you think that he is selling copyrighted work of others, then please contact the author (
calorie) and help her to stop people selling her work.