Problem
When Sally heard her Mom leave she snuck downstairs, opened the box of Oreos and ate 3 cookies. Sally resealed the cookie box but left some cookie residue on the box and threw the wrapper into the trash. Sally got thirsty for milk. When Sally heard her mom coming, she left the milk on the counter and immediately ran back upstairs.
What are the circumstantial facts can rely on to show that Sally ate a cookie?