Keep in mind, not all abductees remember what has happened to them. What they do have, many of them, are skin abrasions, (triangular and pin pricks) marks on their skin, implantations (that have been removed, examined and studied and concluded that they are non-terrestrial technology.
Dr. Roger Leir examined a couple of my friends who were abducted, removing implantations.
Link We have been told that implantation is rare these days as it is no longer necessary to track abducted individuals. They have a different tech for that.