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One of the best indications would be the way the Necromancer communicates with Nazgul. Only the Lord of The Ring could be The Master of Nazgul. As the Necromancer lacked The Ring (and the finger), it was clear, he could have been no one else but Sauron.
I believe that Sauron have never disclosed the true nature of Istari. Otherwise his actions would have been pretty different.
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