Has anyone ever considered the likely thoughts of some far future civilization, or even another species from a world beyond, digging these things up?
"Strange, Kirk. These people buried a mixture of useless junk, bad writings, and valuable gold because...? What gave them the idea that anyone a thousand years ahead would care? What is so special about the bric a brac of a group of semi-civilized barbarians who were given the great gift of a near perfect Constitution... only to let their country deteriorate by ignoring it?"
"There were many, Mr. Spock, who protested. Loud and clear. A fair number of them even knew why and what for."
"Then they buried the wrong things."
"There you have me, Spock. There you have me."
Not a deep puzzle, but an interesting one.