The W-K was destroyed on the Pelennor: Saruman was locked up in Orthanc hundreds of miles away, and Sauron's forces were being routed. Who was there to take it (arguendo), except a Good Guy?
In any event, the W-K's Ring wasn't there: it was safe and sound (for the moment) in Barad-Dur.
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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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