In the episode "Signs and Portents" Londo gains posession of "the Eye", a long lost jewel that once belonged to the Centauri royal family. His friend and fellow noble Lord Kiro is sent to retrieve the Eye, but things go wrong and Kiro eventually ends up trapped on a raider (space pirate) ship whose crew intend to hold him and the Eye for ransom. The raider ship is destroyed by the Shadows yet afterward their stooge Morden somehow returns the Eye to Londo.
I'm puzzled how the Shadows could've destroyed the ship without taking out the Eye as well, and have oft wondered if Morden gave Londo a counterfeit- did JMS ever confirm or deny this?