They don't make it easy. In a moment of haste/madness I decided to order a couple of MSGEQ7 for a small maker type project I'm doing for someone. Chose UK location (yeh, right) and placed my order knowing I should have buyer protection if not by eBay then my c/card.
Chips arrive after a while in a flimsy polythene bag, no mechanical or static protection. Hard shiny epoxy surface exept for the abraded top face with a freshly printed part number. No work. Fake as fake can be.
I report the listing. It took a bit of searching around to find the link, select "IP Infringement" which is the closest option and start typing. But eBay automatically rejects the form with "invalid reason" if the text contains words "fake" or "counterfeit"

In the end I wrote the text into a PDF and uploaded as a supporting document along with photos of the chips. That generates an auto "thanks we're looking in to it" reply, the listing is still active.
I did get a refund from the seller after a couple of attempts. First response was Dear Friend very sorry, we will offer you partial refund for your inconvenience. Second response after I refused was We will gladly refund you but please promise not to leave us any negative feedback.So I got my refund and I left them a really shitty feedback.
So, I'm curious, has anyone actually successfully reported/removed a listing?