Yeah, I am playing a bit of devils advocate here. Things like glyptodon would have been easy targets in theory.
I do wonder if human processing of animals makes their bones more likely to find. Most of what we find about ancient humans comes from trash pits. Animals don’t always bring food to the same place, and scavengers can further distribute and decompose parts.
There have been cases of human bone caches made by animals, like in the Sauida Arabian lava tube. But that seems like a relatively ideal condition for long term preservation.