Value with / without SPID on glovebox door

[CS1972]

I stumbled on an interesting truck, a 71 Cheyenne Super short box which is in excellent shape, BUT the doors are 72’s, a few other minor issues and the SPID was removed for painting (interior, exterior, engine compartment and underneath). He said he put the 72 doors on because they were much nicer than the 71 originals. The price the guy is asking reflects what “he has seen on Mecum and Barrett Jackson” and that “69-72’s are red hot in the market”. But in my opinion “those trucks” probably had some provenance which proves that the truck was originally built that way. Without any SPID or sales documentation anyone can build a “CST” or “Cheyenne Super” and claim it as “original”. So, my question to the forum is “how much value do you think is lost when the SPID and/or supporting sale documentation is not available to prove what you’re selling is what was sold new”? Or for that matter, does most people who are interested in these even care? The asking price of $25K just seems high to me – based on what I saw while the truck was parked (I left my name and number and we’ve talked a couple times). I hope to go see the truck by the end of this weekend (now with buyers eyes vs the look it over – nice truck but he’ll probably not sell it eyes).
Also, I’ve searched the forum for “Coil vs Leaf” comments and actually was not aware that short boxes could come with leaf springs until this 71 came up for sale. From what I have read the general consensus seems to be: coils for light duty hauling, more ride comfort and leaf springs for heavier duty usage and not bad ride comfort, but not as good as the coils. I’m all about the ride quality so I’m a little concerned about the leaf springs.