I have very few items that are autographed (Id rather have a photo taken with someone than something written on a piece of paper or item), but if I sold you something with an auto that turned out to be fake, when I got it from someone else, I'd give you a refund but that would be all. If you asked for $ for other things you had done, I would tell you to take a hike. Or track down the original owner... etc. If the person you're dealing with has hundreds or thousands of auto's and its a scam, then by all means go for it and sue. If its just a collector who possibly purchased a fake auto himself by chance, then I'd chalk it up as a bad experience and move on. I wouldnt see why it should cost him anymore cash than a refund.

If I purchased an auto and it was fake, I would take responsibility myself for being fooled and move on... especially if the seller gave me refund for the item in question.

Its the risk you take when collecting.