If you don’t see a key, perhaps it is for kickstarter supporter an another procedure (e.g. backerkit?) active?
I finnaly opened my delivery today, after week at school and i get wrong T-shirt size and my box was broken inside 
That is same problem like my package. So my conclusion is that this happens during production but not due to shipping because outer package is undamaged.
really wish i would have backed years ago, would you be willing to share the 3d model? thanks man