Mister Peeks, also known as the Mystery Box Bunny is a stuffed bunny-rabbit featured in Call of Duty: Black Ops Cold War, Call of Duty: Vanguard, Call of Duty: Modern Warfare III and Call of Duty: Black Ops 6 Zombies modes. Mister Peeks also appears in Call of Duty: Warzone 2.0 as an easter egg within the Urzikstan map.

https://callofduty.fandom.com/wiki/Mister_Peeks#:~:text=Mister%20Peeks%20can%20be%20found,Mystery%20Box%20containing%20Mister%20Peeks.