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Steve M.I post a card for sale on the B/S/T. I post a scan of the front and described the back with particularity, i.e. clean, no creases, no paper loss, etc.
I get an email requesting a scan of the back. I provide a scan.
I then get an email from someone who commits to buy the card. No conditions attached.
What, if any, is my obligation to the first emailer?