That's not how the first sale doctrine works. The first sale doctrine just means that you can re-sell a physical product embodying some IP without needing to g

That's not how the first sale doctrine works. The first sale doctrine just means that you can re-sell a physical product embodying some IP without needing to get a license from the IP-owner to make the sale. Technically, for refund/warranty/other ownership purposes, the second-hand buyer now stands in your shoes, and should be entitled to the refund. You could theoretically claim it yourself, but in many states would be committing fraud in doing so.