For what it is worth, if I were a buyer, the negative against your name would not worry me, because you gave such an informative and sensible answer, plus your other feedback is fine. Considering the fact postage & tracking was included in that price, I am not sure what quality a buyer would be expecting. It sounds to me as if you were more than fair.

Some buyers are just ding a lings, but they are in the minority I hope.