If you cut them in half, genuine transformers have three rings, from the three applications of plastic, whereas kos have anywhere from 5 to 17 rings.
you by from a reputable dealer, and you seriously gut check yourself WHY you are buying these, and if it is TRULY for investment grade, then go into properly. If it is simply for collection accumulation (which I think honestly most of us do, but lie to ourselves about) then dont worry if you get a KO for a KO price .. as you said, look better than the original. And I doubt you are going to be playing with them on the . ground for 8 hours a day, so no need to worry about lead poisoning