Mentioned to a customer I had purchased an NOS A body 73-76 AC Heater Box a few years back. I used it to create my gasket set for that box. Told him after I was done with it I had a hard time selling it. He said that because NOS means "Not Of Standard". He said it was a defective unit that was put back on the shelf cause it didn't meet the specs/standards.

He was pretty confident so I didn't want to go down the rabbit hole with him. Guess that means there will be one less person not buying crappy "Not Of Standard" parts