Reasonable request?

[clutch]

I have an autographed baseball for sale right now on Ebay. It is an unauthenticated ball. A potential buyer e-mailed me asking if it did not pass 3rd party authentication, would I refund the cost of the ball, to and from postage and the authentication fees along with authentication postage.

I have no problem refunding the price of the ball, but I think my liability should end there. I have absolutely no doubts that the signature is authentic or else I would not have bought it. I would have it authenticated myself, but it is not an extremely valuable ball and the cost of the ball, fees and postage would pretty much make it not worth it to resell.

I took on risk buying it with no COA. Should that risk now be passed on to the next buyer as far as authentication fees are concerned? I bought a collection of autographed baseballs to resell and I am concerned that this might come up again in the future.

I thought I'd ask some experienced people how they would handle this. Thanks!!