We've been made aware of a recent issue where players are having trouble redeeming loyalty rewards between physical disc copies of Mafia III and Mafia II.
For example, in Mafia II: Definitive Edition you can receive Lincoln’s jacket in Vito's wardrobe and Lincoln’s car in his garage! All you need to do is to have the games in your library.
NOTE: While playing the physical versions, if any Mafia title is completely uninstalled along with the save data, Mafia II may not be able to detect this data and unlock these rewards in-game. However, if you have deleted both saves and game data, you can try reinstalling Mafia to recreate saves, and the other titles should then be able to find them and unlock these rewards.