仕込み
1ハリー・ポッターと不死鳥の騎士団 · A wrapped present at Grimmauld Place
Sirius hands Harry a package and says it is a way to contact him. Harry, afraid of drawing Sirius out of the house, never unwraps it. After Sirius dies, the unused gift is still among Harry’s things.
回収
ハリー・ポッターと死の秘宝 · The shard, then the Hog’s Head
A fragment of the mirror shows a blue eye. Harry thinks it might be Dumbledore. It is Aberforth, who has the other mirror. The shard is how he knows when to send Dobby to Malfoy Manor, and how he sees Harry in the passage behind Ariana’s portrait.
