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and none save maybe Elrond, Círdan and Galadriel discovered of what kind they were or whence they came.UT; Istari
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I don't think it could be taken literally. Saruman knew who Gandalf was and would have told Sauron, if the other didn't know about the Istari already.
I think Sauron came to know about the Istari and Gandalf in particular much-much earlier - for hadn't he run away when Gandalf came to Dol Guldur the first time in 2063? Sauron had been so afraid of him that he hid for 400 years somewhere in the East.
Also consider that the Witch-King knew about Gandalf, (maybe from Sauron, maybe from personal experience during his rule of Angmar), recognized his power and feared his involvement with the Ring:
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Oct. 3: Gandalf reaches Weathertop but does not overtake [Witch-king and other four Riders]; for they become aware of his approach as he overtakes them on Shadowfax, and withdraw into hiding beside the road. They close in behind. [The Witch-king] is both pleased and puzzled. For a while he had been in great fear, thinking that by some means Gandalf had got possession of the Ring and was now the Bearer; but as Gandalf passes he is aware that Gandalf has not got the Ring. What is he pursuing? He himself must be after the escaping Bearer; and it must therefore somehow have gone on far ahead. But Gandalf is a great power and enemy. He must be dealt with, and yet that needs great force. RC, p.167
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As for the Mouth, he did as instructed, showing contempt to both Gandalf and Aragorn - however he was much afraid himself.