They're very responsive on (of all things) Facebook Messenger! It's often Martin Grennall responding, sometimes Peter Q! I just showed them the eBay listing and they validate that the cable looks legit, and then will cross-reference any details the seller provides (name, when it was purchased and from whom, any service history, etc) just to make sure. I always do this when buying AN cables, as the counterfeits are everywhere. If there are any question marks, best to pass on it.