I like how they can still find its rovers and read their names, even now that it's a gorgeous continental planet and future agri-world (thanks to the Guilli's Planet Modifiers and Features mod which can populate a terraformed world with modifiers favoring a particular district type), with the rovers all overgrown by forest and rusted by oxygen and rain. The terraformers must have found Opportunity and preserved it or something.
Small details that are only rarely found are great. It shows someone cared about a corner of nowhere :)
To be fair it was in the same system as Earth, the world whose people uplifted the races that would later form most of our population, and removed the “de-evolved” trait from the victims of some ancient colossus war while gifting them special traits.