You may have nailed it Helen, I had not considered the transient presence of the Ringwratihs and Aragprn's knowledge of their southern 'encampment'.
I was fixated on more permanent or semi permanent denizens, like the trolls in the Hobbit, or the Barrow Wights.
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The dwindling Men of the West would often sit up late into the night exchanging lore & wisdom such as they still possessed that they should not fall back into the mean estate of those who never knew or indeed rebelled against the Light.
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