I am not sure if selma is sold at mk outlet stores. but for me, my selmas have always been wrapped in white paper instead of clear plastic ones. i am not sure with other designs though. so for me, selmas packaged with clear plastic on handles and detachable strap is a red flag. i tried to compare the pictures with my selmas and this is one thing i noticed. the logo at the inside lining bottom part is upside down with respect to the saffiano tab. i currently own 5 large selmas and 3 medium messengers. here are pics of inside lining of 2 of my large selmas.
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for new ones, they would normally come in this packaging
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if it comes with the mk plastic, is the code on the price tag same with the code on the mk clear plastic?
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these are all for now. hope these helps in determining if what you have is authentic or fake selma.