Describing Gradus’ trip from Wordsmith Library to Judge Goldsworth’s house in New Wye, Kinbote (in VN’s novel Pale Fire, 1962, Shade's mad commentator who imagines that he is Charles the Beloved, the last self-exiled king of Zembla) mentions the trilby that he hopes was forgotten by Gradus in Gerald Emerald’s car:
Gradus returned to the Main Desk.
"Too bad," said the girl, "I just saw him leave."