I am afraid that eBay has to rely on reports, using the report link on every listing.
The majority of buyers and certainly eBay staff are unlikely to have the technical knowledge to know from a description that an item is a fake.
That is why eBay provide the 30 day money back guarantee, but it is up to buyers to open a not as described case., and leave negative feedback. Once over the 30 days, if buyer realises they have a fake, then they need to contact their payment provider.