I can also see scrapes and missing paint on the fork in the auction photos. Clearly the description was carefully stated in a way that I think is meant to mislead. Someone who bought a bike new and is now selling it ten years later, after not taking care of it could say it was showroom condition when acquired. Who cares about what it "was" like. All that matters is what it "is" like now that it is being sold or purchased. The others have provided the best advice about filing a not as described claim with Ebay and then letting him deal with that. On the other hand, I would steer clear of Ebay if you are not well versed in weasel clauses.
Buyers do rule on Ebay, but that can be a bad thing too. I once sold a very expensive cashmere overcoat for very cheap and the buyer said it wasn't cashmere and that I must have sewn the tags in it. I don't even know how to sew, and the close-up photos of the tags clearly showed that they were factory sewn. However, PayPal sided with the buyer. After several phone calls, a lot of threats, hassles, and accusations, I got the coat back at the buyers expense and he got his purchase price back. Ebay continually siding with the buyer is not always a good thing.