Think of the movie 'Inception'. Not the content of the film, but the actual film itself (the reel of film). Is there a concrete place where the people and things on this reel of film exist? What you see on the screen is in your imagination. So if you believe in objective reality, what is shown on the film stops as soon as the film ends. So there can be no objective answer to what happens to the totem.

To answer the question you are already presupposing that the imaginary world depicted on the reel of film continues to 'exist' AFTER the movie ends! Do you see the big joke Nolan has played on his audience? The content of the film 'Inception' is a dream in your imagination. If you ascribe this enough 'reality' to think you can continue to reason about what happens, you are already presupposing the premise of the movie... that dreams have some degree of reality.