Fake/Real Low Concords

I was just wondering if anyone can help me out with identifying some signs of real or fake low Concords. I have heard that even on pairs shipped directly from Nike that sometime the 23s are not perfectly straight. Also I have heard that the Jumpman on the inside of the sneakers is off. Please help out and thanks in advance

Post some pictures, Have a pair myself so can assure you what I say is correct! 

What do you think of these? http://www.ebay.com/itm/191491825500?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT