From Game Revolution: “Its not quite a shock given how developer Arkane helped with the title but there is a Wolfenstein Youngblood Dishonored Easter egg. You can find one of the runes from Arkanes classic stealth immersive sim. This Easter is also called the souvenir of Dunwall, which is where the first Dishonored took place, and will net you the Tribute trophy or achievement if you track it down. So how do you find the Dishonored Easter egg in Wolfenstein Youngblood? Buckle up because this souvenir from Dunwall might take some gear you dont have.”
Source: N4G PC Wolfenstein Youngblood Dishonored Easter Egg | How to find the souvenir from Dunwall