This is huge for the potential of literal "pre-historic" civilization. Of course it's completely hypothetical, but this discovery gives it at least some actual potential. Just kinda incredible to think what could've existed. Plastic degrades in roughly 600 years at the long end. It's a tall order to make a building that will last for 10,000 (doomsday seed vault). What was lost in the library of Alexandria? How much of our own history did we actually know in the past?

Unfortunately I think these questions and similar ones (impossible without an answer) will haunt me until the day I die.