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It appears to be authentic they probably have an account with Mitchell & Ness. If I had to guess though I would say it is probably a factory defect for that price.
They probably have some jerseys that they sell to good account holders with minor imperfections scuff marks etc.,, at a huge discount. It is really hard to tell by looking at the pic but you can kind of see a scuff mark in the #3 on the McGinnis jersey.
They are probably still great quality with just minor imperfections so M&N probably gives them huge discounts on those even though the defects are minor it would be impossible to sell a person a jersey with scuff marks etc.,, when you are paying $350 for a jersey you tend to be fussy and don't want even the slightest imperfections.