The Old Country. While you don't need to find them all for 100% completion, each of them grants you unique passive

MP1st Mafia The Old Country Review - Mafia The Old Country manages to tell a compelling a story, though struggles to balance its gameplay.

Mafia: The Old Country isn't a bad game, just a tepid one. Its gameplay is flaccid and restrictive, its narrative is dull and predictable, and its world has no more charm or presence than an Unreal Engine tech demo. It nails the bare minimum, but a game like this, from a franchise as beloved as Mafia, should have gone beyond that.