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I don't know what you could be doing wrong. The operation of the box of chocolates (if we talk about the Candy Crush, of course) is: You open the box and there are 16 different missions. You have to select one and confirm it by going to the map. Then you have to play as always and complete the mission. When this happens (you will see that the mission bar is full) you have to reopen the box and select another mission. And the same until you complete the whole box. I hope I have been helpful
The box of chocolates contains 4 units of each color, when you choose 1, at the end of the mission, (the remaining 3) disappear.
You can do 3 missions consecutively, but in the last one you have to wait a few hours, (this is how it is designed) to finish. Perhaps it is to synchronize it with daily wins or with another promotion.
I hope it helps you. Regards