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The only time-frame during which that would have been possible would have been within the preceding year, IF (we don't know this) Gandalf passed through Rivendell on his way from Mirkwood, where he interrogated Gollum, to the Shire, where he had the "Shadow of the Past" conversation with Frodo. From thence he went straight to Isengard, and didn't reach Rivendell until shortly before Frodo's arrival there.
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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