67 nos ss hood

[67ssrsl78conv]

going to look at a horde of nos parts and i'm wondering if there are telltale signs to differenciate between a gm nos ss hood and aftermarket? gentleman says the hood is nos but there is no box left and no stickers. 

[68Zproject]

http://www.camaros.org/forum/index.php?topic=5445.0

There's a picture down about 4 posts that shows what the corner of the hood by the cowl should look like.