Quoted from too-many-pins:

On the plus side these are not copies being made from the original blueprints he is selling them as he is pulling them out of boxes or drawers. The negative side of things is there were likely at least several copies of each because they would have been circulated to different departments as well as to outside vendors.
Sadly it looks like the stuff is sub assemblies and not prints of actual playfield layouts etc which would likely be more money. I don't think his "original" listing price is out of line on these but I don't see any of them bringing "big dollars" because of what they are. Kind of a cool piece of pinball history but how many people are really going to care.
It is nice seeing them being saved instead of going to a landfill but after Planetary Pinball, eBay, Paypal, & Postal Service get their share I doubt if the seller is going to be making much money selling these. Hopefully it will be profitable enough for him to continue but I guess only time will tell.