Same with me. For some reason, some orders from the US sometimes hit me with duties, sometimes not. Most of the time when it happens it's like 8-9 dollars. I complain, pay it and go on with my day.
But I have a feeling that a big box with not only books may be different. If it's a significant amount, I'll definitely cancel and ask for a refund. Which makes me wonder if a small company like Exalted Funeral can even process a significant amount of refunds. It might work budget-wise because they'll sell these stocks later, but it might not work cashflow-wise.