Do "NOS" gears have lapping compound on them?

So, I was telling a local junk yard/collector about how I would like to find a set of 3.23 gears. Well, supposedly He found a "NOS" set. I was skeptical because they claim to be "coated with the factory yellow lapping compound "... That sure looks like the marking compound used to set up the gears. Also, the threaded portion of the pinion looks like it has rust above where the nut would set if it had a yoke tigthened down on it.

What do you guys think... are these NOS gears or... have then been setup before and never used? Does that look like red loctite in the threads on the ring gear?