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I don't think that Sauron believed Pippin to be the ringbearer. For one thing, the witch-king must have told him about his meeting with Frodo. As we know from Reader's Companion quote from Marquette, page 180, which has been presented several times on this site, the witch-king believed Frodo to be very powerful, able to defeat a barrow-wight and to even withstand the witch-king himself, almost giving him a mortal wound. Pippin is a _far_ cry from this.
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