Good evening. I would stick to your guns. I would also report this to the online site through which you sold this. You are very likely to be the victim of a common scam here where they buy an authentic item, then switch it and claim that the fake one is the one you sent. I would send them a copy of the receipt and tell them if they want to pursue this legally, then "come on." My bet is that you will not hear from them again. If you do, contact your own attorney.
I hope this has given you the guidance you were seeking. I wish you the best of luck!
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The information given here is not legal advice. As all states have different intricacies in their laws, the information given is general only. This communication does not establish an attorney-client relationship with you. I hope this answer has been helpful to you.