Wish we could detect such things.
Maybe in the future they can find if there was some contagion running havoc the same way they studied the contents of the jars, using new tech and techniques.
We can. And they have.
They detected the “Spanish Flu” genome/DNA, which killed many millions worldwide, in graves, from exhuming bodies... but that was only a hundred-or-so years ago. The P4 Bio-Labs have samples of it and experiment on it. But thousands of years is a whole ‘nother matter.
It scary what they have in this bio-labs; enough to wipe the Earth sterile... except for termites, crickets and demonKKKrats. Heh...