It's the big problem with KS exclusives. What do you do with the left overs once everyone got their KS package if you promised they would be exclusive?
We (backers) were told that a limited number of extra would be made and possibly given away or sold after all the backers received their heavy crates. Extras were ordered to fulfill any damages and also as promotional material. It is only smart to add on to that quantity as the suppliers need minimum runs. But, backers were told in advance that extras would be sold.