He has some nice stuff for sure, but like ir3333 said NOS doesnt mean mint...it coulda been boot-f**ked around the shop a bit.
You wouldnt get it for $300 if it was perfect/mint. Considering it appears to have been never mounted on a car or it aint folded in 1/2 the price isnt that bad. Christ if I could find 69 cuda grilles in that shape and that price I would buy 10 of them.