Buying second hand item always carries risk that item cannot perform as intended. If testing was done prior to the transaction, seller and buyer agreed on the condition, i think the seller cannot be held responsible for sold item.
Similarly, if a buyer reserved a fish from someone and later when prompted said will call back to confirm and never get back, do you think the seller should pursuit and broadcast the matter? Does this ring the bell?
Just take it as a pinch of salt and reef on.