It does say Gandalf entered Dol Guldur in disguise. His great wisdom and 'luck' (if there really is such a thing} allowed him to pull it off without being caught.
As for why Thr*áin was not relieved of his map and key after capture, Gandalf surmised that Sauron only wanted the last of the Seven that Thráin kept, and once he had it he merely 'flung the broken prisoner into the pits to rave until he died'. It makes sense to me.
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