Or
a few weeks after selling, go to resolution centre, open case, cancel sale for reason “other” and send.
Most click cancel, some question it where i just say apologies, i sent it to you in error, please ignore, some decline and most ignore it.
In all but decline cases you then receive a final value fee credit once you close the case after 7 days!
Cheeky yes but causes no issues and you can still leave feedback. So if it happens to you you know why, just click accept. Its a strength in numbers thing