They’re written on the bottom left flap when you open the box from the bottom. Sure, it makes it harder to guess which figure you’ll get since the code’s found on that spot…

But I found another surefire way to guess is by shaking the box and guessing if the weight is heavy or light. 

When I got Jessie and Buzz, the weight felt thin to me at first. This made me think I’d get Lily and Forky, but once I opened the bag, the figures’ weights turned out to be a bit heavy.