Would have to agree with NP, you have "something", and you fall into one of several categories. The "keep it to yourself" so you can get the stuff, the "Hmm, maybe I should share this with others and we can combine what we know in finding the stuff", and the "Don't have a clue what this means or what it's for, so I'll just toss it".
Seems Doc fell into all three, he found something, where actually can be argued, and may be part of the VP story. Was the VP a ruse for what/where he found? Did he try and hide the actual info by seeding VP? Was it someone's prior stash he found out about?
Then he told folks about what he found, granted maybe/maybe not for honest reasons, to gain help, to share, and see what it got him?
Greed is an evil thing. And it looks like it was two sided. Doc without sharing the possible actual spot, scamming folks, and then him being on the wrong end of a gun. All greed influenced.
As for the latter, the papers he destroyed, unless he sat there and read through and understood perfectly what they said/meant, he could easily have tossed more info that could have proved quite valuable, if not the papers themselves which would be worth money for what they were.
I guess there's even a forth category. The "I have this, know what it means, where it is, but it will bring no good to anyone now, so I won't be the one who's responsible for a lot of sorrow, so I'll make sure no one else finds it"
Me? It think I fall into the second. Granted I'll never be out there looking for these kinds of treasure, at least not for the monetary part. For me it's the hunt that gets me going, finding that little scrap that others missed or never thought of. And hopefully I might in turn pass something on that will help someone else.
And maybe even the forth one too. My Gramps was the text book version of "Dirt Poor Farmer". Never had anything of value it seemed. He was my Dad so to speak, my Dad was in the Army, teaching folks to jump out of perfectly good airplanes while I was young. Gramps had "friends" who always had extra hay/straw/oats/corn/feed that ended up in the barn. Same folks did all the planting and harvesting of crops on the place. Gramps called me Scarecrow, as I had a birthmark patch of blond hair while the rest was nearly black. He'd say it was the straw leaking out. He told/showed me things around the farm, and I met many of his "friends". Some were some rather nasty folks. Had my first taste of Shine when I was 4.

And I was always introduced to his "friends" as the Scarecrow.
Anyhow when Gramps passed on the vultures moved in, the rest of the family. Seems the "Dirt Poor Farmer" also owned a butcher shop, an insurance agency, had hands in both a pair of new car dealerships and motorcycle dealerships, a department store, and hardware store, a furniture store, and a natural gas/propane dealer.
The vultures got it all, and lost it all in a year. Me, I got to buy the farm, after the vultures decided the price...6 times the price it was worth. But I wanted it, more for the heart then the mind. Wanted to keep what was Gramps.
Well that led to more heartache. Gramps had never told anyone he had contracts waiting for the coal/timber/natural gas on the place.
So I ended up having to battle the vultures over it. The place no one wanted, until they found out. Well some of Gramps "friends" were attorneys, they handled and won the case, and I never saw a bill for it.
After that I decided to not open my mouth about what else is there. Gramps being Gramps, made me work for it, showing me the signs on the farm that would teach me to find the spots. 3 spots so far, and funny I know some don't believe in Dowsers, but three different ones, all unknown to the others, all nailed the three spots that I had located. Pretty good hitting three spots on 200 plus acres of ground. And all three spots are just like the Dutchman's description, you will walk right over it and never know it's there.
I don't need the grief that would occur if I went and dug them up. I don't need them, I'm not rich, but I have enough to pay the bills, and want for nothing. And I don't worry about them, I now have some of Gramps "friends" taking care of it. Attorneys who will let my three sons know of it, they know nothing now. Each holds something different. And to just take care of the greed thing, all will be gathered at the same time, added up and split 3 ways. The vultures will be gone by that time. And the spots themselves are looked after by "friends", the nasty ones. They for some reasons that I do not know fully yet, know that only the Scarecrow gets what is there.
And I guess Gramps being Gramps has one of the spots marked, with something that only I would know in a heartbeat. It's so obvious to me now and so not so to anyone who would be looking for it.
Honestly I'm having more fun working on who Gramps was. Digging into the past, and finding out more and more of who he was, what he did, who he knew, and so on. It's a wild story. And that for me is my Treasure.