identifing genuine wings

hi can anyone tell me how to identify genuine front wings? where are they stamped?thanks

They're stamped on the fold nearest the door/A pillar if that makes sense.  So not easy (impossible?) to see when fitted.

On a VW Mexico made wing they are tagged with a VW logo on the top where they bolt on, the Mexico one I saw was grey primer (rather than the usual black for German ones).