I went to the Ah-Tah-Thi-Ki Museum at Big Cypress reservations yesterday. I go there to get away from the park here! I like to walk the 1.25 mile boardwalk in the cypress dome for exercise.
While I was there, they told me that the museum will be closed from August 10th to September 1st (Labor day). They are trying to get rid of some mold that has developed since Hurricane Wilma tore part of the roof off, three years ago.
So if you want to see the Osceola exhibit, do it by next Saturday. Otherwise, you will have to wait until September.