Authenticity of Speakers

Hi all,

This is my first post on the forum. I am in process of building a home theater. I found a guy on craigslist selling Klipsch R-28f speakers, $500 for a pair. How do I check the authenticity of the speakers. Have anybody come across fake Klipsch products? He says, he got those from Storage Locker auctions. Should I trust these speakers?