Wow, seriously? Was that a one-time mishap or were there more of this combination? If so, there is only one word to describe this: FAIL. I mean, how could they miss that? Even the Chinese workers who have to make and package these things surely will know what Darth Vader looks like, and that this is clearly not him?
I could only Imagine how you brought this to the store's attention.
Ryan walks to the desk holding it, Employee: "how may I help you?" Ryan:*points the box* Emloyee: "what?" Ryan:"look!" *points to Darth Vader label* Employee:"what is it sir?" Ryan: "what character is this?" Employee: "... a Stormtrooper?" Ryan: "read the label!" Employee: Dar... oh, haha I'll take car of that! Have a nice day!"*takes box*