Bijou Parrot tries to steal the walnuts

The little thief waited until I fell asleep and made off to get the walnuts. Suddenly I heard a crackle but the box is closed very well, she tried to touch the yellow cup with the hope that a walnut is coming. Whenever I have trained with her and the yellow cup and she manages to put the lid in or lift it up, she gets a treat. Well, she thinks if I touch the yellow cup a miracle happens.