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100,000 years is not enough to restore the loss of species diversity completely, or for the most pernicious poisons to dissipate. But, it's more than enough time to erase all obvious traces of human built environment. Nature is powerful. Shocking how quickly a forest can gobble roads and buildings.

I'm certain the aliens in the story will find traces of humanity eventually- but, if you discovered earth wouldn't you be so distracted by the biodiversity that you might not get to that right away?