It's been a big problem for a while. Think about the airplane you are flying in--what if some part had been inadvertently installed from counterfeit sources?It's happens. The Air Force was sold a bunch of counterfeit o-rings a few years ago - made of recycled wiper blades.
chinese counterfeitng
I own dartzeel amp and preamp. I was checking out pricing and noticed dartzeel amp selling for $650 on ebay. I checked into this and they make it look externally the same but obviously not internally. The sellers were mainly from China. If they can make the amp look real I bet is would be an easy process to fake a cable or anything else for that matter