Were any pictures provided prior to sale?
He posted two photos, unfortunately it's hard to see a re-sharpened blade unless you look for the right angle and shoot a macro. Rust spots were on the back of the blade so I didn't see them... both photos were here:
http://www.bladeforums.com/forums/showthread.php?t=791207&highlight=s90v
Anyway, if someone tells me it's a NIB knife I trust him or ask him to make sure it has no defects, as I did with LorenzoL and bigmark408. It's funny because bigmark408 got a little angry about this question and I had to explain what I meant (a NIB knife may have some defect).
I also looked for people complaining about this guy and didn't find anyone, so I felt pretty confindent... till I opened the bade.