How was the boy's body so well preserved?
It's supposedly been many years since Nathaniel drowned in the marsh and his mother killed herself, yet when Arthur goes out to get his body, it looks like he's only been down there for a couple days.
While there have been instances of bodies being recovered from bogs in good condition, a marsh isn't exactly a bog. They lack the qualities that cause a bog to mummify flesh. A body in a marsh for several years, even if covered in mud, would be badly decayed at best and probably nothing more than a skeleton.
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