Conversation so far:
What relics are notable from the life of Osceola?
By 1885, the death mask and some of Osceola's belongings were being held in the anthropology collection of the Smithsonian Institution.
Any other notable relics from the time around Osceola's death?
In 1979 the Seminole Nation of Oklahoma bought Osceola's bandolier and other personal items from a Sotheby's auction.
What else was of importance after Osceola's death?
Weedon apparently preserved Osceola's head in a large jar of alcohol and took it to St. Augustine, where he exhibited it in the family drugstore.

Question: What happened next?
Self-contained rewrite: What happened next when Osceola's belongings gain popularity?