I have had a few treasures like this in the back forty and found in surrounding properties over the years, since us backwoods types can't seem to get rid of stuff in a reasonable time frame if we have someplace in "the way back" to put 'em.
Since my cousin has one big ass junkyard within spittin' distance of me, we get to it well, when we get to it.
The wonder of it all is the quality of the chrome and it's content being so much better back then. It would in many cases outlast the rest of the vehicle as depicted, and... would stand up easily against today's crap. Now, I have a few bits and parts I found over the years as nick-nacks, much to the wife's chagrin. Best story.... I got some fine chrome and hubcaps off a mid fifties Desoto and sold on Ebay. Not too shabby a profit. This'n coming from a guy who sold a mailbox found tossed out back Goshen woods on Ebay as well. ( I just don't have time for all that nowadays ) My fave though was an old Ford behind my dad's property that a new owner eventually got around to cutting up and pulling out. I called it "Uncle Otto's Truck" All I have now, are memories, a screensaver at work of it (that gets me some looks but most people think it's cool as heck) and, best of all from the truck I have an original painting of it from one of the most talented artists I know and in my mind the best O' the Pines. A priceless and thoughtful gift.
I love to see it here when folks find stuff like this and record it and share. My guess on your Caddy... A stolen car taken on a joyride and left for dead in the Barrens. Maybe just someone ticked the wrong person off, I do not know. I am sure there is a tale worthy of a nice listen out of it yet for now, all one can do is wonder, and wonder is good enough.
g.