We're not left over with hundreds of thousands of blades scattered around the place. What did we do with our weapons when they were no longer needed?
Obviously I'm not just talking about swords. Spears, axes, maces, halberds, whatever. I know we have large collections of ancient weapons all around the world, but where are the rest? Were they repurposed? Lost? Broken? Discarded?
More can always be said on the topic (personally I think the slant of your question details is ground so far untread on the sub); in the meantime, here's a previous answer from u/WARitter on a similarly-phrased question. His last paragraph deals with the stuff that didn't survive.