Sorry about the confusing title, it's kind of impossible to condence this into a single one-sentence question.
Background information (skip if you already know a little about Divergent and Inception):
Divergence: In the book Divergent, people are tested by being injected with a serum that induces fear by triggering certain areas of the brain, causing a "simulation" in which you have to face your worst fear. For example, if you were terrified of enclosed spaces (claustrophobic) you would suddenly find yourself in a tight box that you couldn't break. Some people, the Divergent, can tell when they are in a simulation, and manipulate it(so break out of the box, or make it bigger).
Inception: The movie Inception is largely about a technology that allows people to share dreams, and consciously shape them, controlling what happens in the dream and manipulating the setting. The main character of the movie always carries around a token, a unique item that only he knows about to be able to see if he is in reality, his own dream, or somebody else's.
How would you know if you were in a simulation created by the serum in Divergent (assuming you couldn't manipulate your surroundings or just 'know'?
I ask this because it seems that the idea with the token would NOT work in the question, as your own brain creates the simulation, and therefore you would know about your token and it would be included.