Based on the context and the answer, generate a question. 

Context: My bag had n't been * visible * from the door ; in fact , it was on a shelf above my desk in anticipation of moving said desk ( which then did n't happen ) . And now my bag was moved down , sitting on top of my desk , still containing phone and sunglasses but now sans wallet . I cursed and quickly checked for anything else missing .

Answer:

Someone robbed me without being witnessed .



Why is it important that I could n't see my purse ?