What do you mean by opening the blind box?

The contents of the box are unknown. We don't know what's inside until we open it. Opening a blind box is like opening a courier. The difference is that the courier knows what it is, but nothing in the blind box, because it is sent randomly. Because you don't know the real things inside, unpacking a blind box is more interesting and exciting than unpacking a courier, but the result is often unpredictable.