Do "NOS" gears have lapping compound on them?

I agree that they don't look like they were run but it does look like someone pressed a bearing cone onto the pinion. Maybe they started to use them then decided on using a different ratio? Looks like rust on the pinion threads, not Loctite. That'll most likely clean up with a wire wheel. I'd run a thread tap into the ring gear bolt holes cause they also look rusted. Their 3/8-24 left hand threads. As Pishta said verify that they are a matched set by the numbers and date code on them. The +1 is a designator that the factory used. They had a specific factory pinion depth and that designator is how much to vary from it.