Objects
Firebolt
The Firebolt is a racing broom of international standard. An anonymous sender leaves one for Harry after his Nimbus is destroyed by the Whomping Willow. Hermione suspects Sirius and reports the parcel. The broom is later cleared, and Harry flies it in the Quidditch final and in the first task.

First mention
Harry Potter and the Prisoner of AzkabanChapter: The Firebolt
The broom arrives by owl at breakfast, unmarked except for a note that says it is Harry’s.