I haven't sold a lot on ebay in a while, but when I did, I handled it this way.
I offered a 2wk money back guarantee for any reason and a lifetime one on authenticity. I used to put a link in my auction to the quick opinion service for buyers to use if they wanted. I sent a clear receipt with my name, address, and phone. That's it.
I would not offer to cover anyone's authentication costs as the decision to send it someone for their opinion is their's, not yours.
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