What I think would be unethical (or at least would make me uncomfortable enough to avoid doing) would be to list this on eBay with the auction LOA AND a scan of the original auction house listing and no further information. That would make any people who happen to value JSA's certs falsely believe that a full LOA would be a cinch, and I'd bet that at this point your friend would make the most profit this way. It would be dishonesty through omission, however.
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