The passages that provide explicit or implicit support for the statement that the sled was carrying a coffin are:
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"On the sled, securely lashed, was a long and narrow oblong box. There were other things on the sled – blankets, an axe, and a coffee-pot and frying-pan; but prominent, occupying most of the space, was the long and narrow oblong box."
- This passage explicitly mentions a "long and narrow oblong box," which could be interpreted as a coffin.
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"At the fall of darkness they swung the dogs into a cluster of spruce trees on the edge of the waterway and made a camp. The coffin, at the side of the fire, served for seat and table."
- This passage explicitly refers to a "coffin," clearly supporting the notion that the sled was carrying a coffin.
The other passages don't directly indicate that the sled was carrying a coffin, so they do not support the statement as clearly as the ones selected above.