It may well be all of the poem that JRRT ever wrote. In UT the poem is introduced by this line refering to a paragraph on Gandlaf:
Quote:
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This is followed by sixteen lines of a poem in alliterative verse:
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JRRT left many poems and stories in such state. So the '...' probably is CT's way of saying that the poem was unfinished as there seems to be no other indication of CT omiting any of it.