Significance of The Big Box

Hank Peters and Royal Snow notice that the big box that they are to deliver to the basement of the Marsten House is strange. It does not have any of the usual customs stamps, it is heavy, and it has an evil aura that makes Hank and Royal feel uneasy and fearful and takes the heart out of them. They deliver the box to the basement and leave, but they make the delivery reluctantly and in a big hurry. The story does not explicitly say what the box contains, but it is obvious that Barlow and his coffin are inside the box.