system
Given the following post, respond as if you're commenting on Reddit:
human
Stupid question, If there were metal buildings/electronics more than 13k+ years ago, would we be able to know about it?

My friend has gotten really into conspiracy theories lately, and he has started to believe that there was a highly advanced civilization on earth, like as highly advanced as ours, more than 13k years ago, but supposedly since a meteor or some other event happened and wiped most humans out, we started over, and the only reason we know about some history sites with stone buildings, but no old sites of metal buildings or electronics is because those would have all decomposed while the stone structures wouldn't decompose

I keep telling him even if the metal mostly decomposed, we should still have some sort of evidence of really old scrap metal or something right?

Edit: So just to clear up the problem that people think I might have had conclusions of what an advanced civilization was since people are saying that "Highly advanced civilization (as advanced as ours) doesn't mean they had to have metal buildings/electronics. *They could have advanced in their own ways!*" The metal buildings/electronics was something that my friend brought up himself.
gpt
Look into glass. Even if all the metal magically vanished, glass would remain. Take a common glass object like a Coke bottle and leave it exposed in the woods. It will take roughly a million years before you can't tell it was made by Coke. We have none of that evidence anywhere in the world. If you buried it in a desert cave, it could take tens of millions of years or more. We also have satellites that are so far out in orbit that their orbits will not decay. But we don't see any dead satellites in orbit that we didn't put there.