If any seller even mentioned feedback to me they would either get none if the item was perfect or a neg if there was the least little niggle.

After about 55 days I used to send an email asking if they could confirm they had received the item so I can archive the transaction, sometimes that prompted them to leave feedback & sometimes they emailed me to say they had indeed received it in which case I just left it for them and archived.

The harder you go after feedback the less likely you are to get what you are hoping for.