It stands to reason that a 95 million-year-old tooth shipped to my home would have a rich past. But what ensued after I bought it online for about $100 revealed how, for such relics and those who covet them, the present is in some ways much more complicated.

I always wanted to own a fossil, and once the algorithm picked up on that desire, ads flooded my Instagram feed. It then became impossible to resist the thrill of purchasing a piece of one of the largest predators that ever existed: Spinosaurus, a semiaquatic meat-eater that could reach almost 60 feet (about 18 meters) in length — longer and heavier than Tyrannosaurus rex.

When the package arrived, in a pretty glass dome and with a preprinted certificate of authenticity that stated it came from North Africa, the long pointy tooth loo

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