Just to play Devil's advocate, it seems odd to me that anyone selling a Hot Toys piece would firstly know for sure what pieces are genuine, and what basic components are missing from the speeder bike. But if the seller possibly came upon the figure set through the estate of a father or other relative, or purchased it along these same or similar lines, the seller might just be trying to liquify some items of which he or she was never the actual owner.
In other words, if the seller is not a Hot Toys collector themselves, then they might be unaware of the defects and substitutions being unfamiliar with the piece. Not an excuse, of course... People are responsible for their own listings, and in this scenario should have done the research up front. But I'm gald you at least made contact with them first and at least gave them an opportunity to explain and remedy. The fact that they haven't responded yet may make all this "Benefit of the Doubt" stuff I'm selling moot, however!