Dead Cat and other resurrection items could be useful for extra attempts. It is technically possible to unlock The Lost while holding Mysterious Paper, although the probability is small since it only has a 1/4 chance to imitate the Missing Poster.Glitter Bombs, in conjunction with a large enough or infinite source of bombs (such as a Gold Bomb), have a small chance to drop trinkets, making it easier to find the poster.Looking for Mom’s Box in shops makes finding the poster easier.Step by step to unlock The Lost in Binding of Isaac Afterbirth: How to Unlock The Lost in Binding of Isaac – Afterbirth