To all people who are guessing he left name servers as they were before expiry.
How it is possible? When the domain is dropped it loses every information associated with it, and in most cases the service or person who snaps the domains sets his default nameservers. How come he changes nameservers to old one?
And to the thread OP, I'd say if the domain is not much important to you .. then contact them and sell it to them, explaining the situation.
By the way, I doubt you snapped it from expired status. May be you purchased it from someone who claimed it was expired, whereas its actually not. And he had access to domain by some illegal means.
