One telltale sign that it is a fake is looking at the velcro bands on the DBS packs. If they wrap around the DBS and/or have AudioQuest written on them in white, then they are most likely fake. Just look at some pictures of authentic cables online and compare them to the eBay ones.
There are of course more precise copies, so this is just the obvious one. I would try to stick to buying AQ cables used from well rated sellers or even better dealers if you are looking for authentic cables. Even still I have heard of stories where highly rated people end up innocently selling Sky cables they thought were real and turned out to not be the case (refunds were issued as I recall).
There are of course more precise copies, so this is just the obvious one. I would try to stick to buying AQ cables used from well rated sellers or even better dealers if you are looking for authentic cables. Even still I have heard of stories where highly rated people end up innocently selling Sky cables they thought were real and turned out to not be the case (refunds were issued as I recall).