Missing Poster

The Missing Poster is an unlockable trinket.

Effects

 * If Isaac dies to the center spikes in a Sacrifice Room while holding it, a particular puzzle piece will be displayed as the cause of his death on his last will.
 * Dying to the center spikes in a Sacrifice Room while holding it will unlock.
 * If Isaac dies while holding this trinket and has already unlocked The Lost, he will be revived in the previous room as The Lost and Missing Poster will be consumed.
 * This counts as a free extra life for The Lost.
 * If dies while holding the trinket, he does not become the normal Lost and is revived as is.
 * Other tainted characters will still revive as the normal Lost.

Puzzle Pieces

 * The puzzle piece will belong to one of four jigsaw puzzles. To which one is indicated by a tiny grey symbol to the top left of the piece.
 * The symbol can either be a pixel, a 2x2px square, a 3x3 px square, or four pixels arranged like a plus-sign.
 * Each jigsaw puzzle displays an altered last will for the characters, , , or respectively.
 * Each picture on the last will shows in which way Isaac has to die when playing as the respective character to unlock The Lost.

In-game Footage
Note that this footage only applies to the Rebirth version of this trinket and does not show the changes made to it in Afterbirth.

Trivia

 * The first scenes in Ending 15 and Ending 17 show The Missing Poster pinned to a utility pole, with a silhouette of Isaac's mother who seems to be searching for Isaac in the background.
 * There are many puzzle pieces in total. Assembling all of the jigsaw puzzles and figuring out what they meant was initially designed to be a collaborative effort of the community. As such, Edmund and Tyrone had openly expressed disappointment towards the datamining.
 * The unlock pop-up of Missing Poster calls it "Lost Poster". Unknown if it's a mistake or a hint.

Seeds
Note that achievements are disabled when using seeds. 38JD 9HNG (Curse room adjacent to spawn, drops after clearing the room) (doesn't work in repentance) OBZH H2Y0 (Missing Poster in a Slot Machine in Flooded Caves II, Sacrifice Room in Necropolis II, both floors have Curse of The Lost)