It is impossible to directly peek into the box and observe the cat without disrupting the quantum superposition and causing the wave function the collapse. Merely observing the box itself would introduce external interference and thus, the cat would no longer exist simultaneously in both states.
In quantum mechanics, the wave function represents all possible states of a system until observed or measured. In Schrodinger's cat experiment, the cat would be in a superposition of states, both alive and dead, until the moment the box is opened.
Therefore, to preserve the quantum superposition and avoid disturbing the experiment, it is impossible to peek at Schrodinger's cat without affecting the outcome.