eBay cannot act on reports from members saying articles are fake / counterfeit, as the messages could be coming from a disgruntled buyer, or even a competitor. eBay do not physically see the item and cannot judge just from photos.
What they do take notice of is cases. If enough buyers open case for item not as described for those items resulting in an abnormal number of refunds, this raises red flags to eBay, and they then act with selling sanctions or even selling bans.
@jaboh3475