Actually, once the frame collapses and gets covered in earth, it'll likely decay way faster than bone. Note the incredible lack of early iron age tools compared

Actually, once the frame collapses and gets covered in earth, it'll likely decay way faster than bone. Note the incredible lack of early iron age tools compared to bronze age tools. That said, it's super unlikely that all, or even most traces of humanity will be gone. As you point out, the redistribution of resources - most specifically our landfills will probably be clear signals on the time scales of at least 10s or maybe 100s of thousands of years.