Back in the 80's 12 matches were played by the winner of Coppa Italia and the Coppa finalist until they got to the final. Today all it needs are 5 matches.
I want to say that back in those days it took 6-7 seasons for a player to gather 50 Coppa appearances and Del Piero needed some 17 years to get to the number 50, so a logical conclusion is that there are players who played in Italy +25 years ago that surely have more than 50 appearances.
Edit: To talk with facts, Mancini has 120 appearances, Bergomi 119 and 8 other players played 100 or more coppa matches.