If the Augurey was born in Malfoy Manor to his aunt, how did Draco Malfoy not know about her?
He would've revealed her and cleared his son if he had known.
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I'm going to go with the solutions in this question:
Basically, that Bellatrix used concealment spells and had the baby a few months before the battle of Hogwarts, when Draco wasn't around.