An ancestor of mine, Sir Henry (Vaughan)Halford, managed to keep part of the 4th vertebra of King Charles after the autopsy in 1813.
Some stories say he used it to serve salt at dinner parties.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2600044/
I heard about that. Apparently Queen Victoria was not amused and made him return it to the rest of King Charles’s remains.