Don,
NOS refers to a FACTORY produced part ..usually it is something that was in inventory and never sold ...and NOW 50 yrs later someone has these items prob. bought at auction and if there advertisment is true ..the parts should be in the factory box with the factory part #.
I have scored some nice parts for my Laguna project that are in the sealed GM bag ..or at least have the GM part # sticker on em.
Hope this helps
Tim
