One of the few times I have ever had a problem as a buyer on eBay occured recently when I bought some razor blades. Razor blades are expensive in the shops and by buying in bulk on eBay you can make some real savings. I’ve been successfully saving for years. However, I recently bought some fakes, despite my diligence.
Doubtless the easiest way to indentify fake blades is to shave with them: they’re as blunt as butter knives and your skin feels awful afterwards. But if you want more information I recommend this site: www.fakeblades.com.
It’s a well executed fraud; the products are convincing and I suspect that some sellers have no idea they are peddling counterfeits. But the clues are there.