Purifier/Outcomes

Success
If you spoke to Lockwell about the evidence:
 * The number of Guards in Monsoon is increased, and they will aid in the player's final faction quest.

Depending on who you hand the evidence to:
 * Rissa Aberdeen: 25 silver, and a Writ of Tribal Favor.
 * Note: Rissa may be at the Burnt Outpost if you did not finish your faction quest yet after the attack on Berg
 * Mathias: Mathias opens a small equipment store, 25 silver, and 1 Palladium Scrap.
 * Sagard Battleborn: 50 silver, and members of Blue Chamber or Holy Mission can ask Sagard for a favor in the final quest instead of dueling him.
 * Cyril Turnbull: 50 or 75 silver, and a Trader Backpack (details unclear on what causes 50 or 75 silver)
 * Jager Sullivan: 100 silver, and 3 Hackmanite
 * Note: He will give 75 silver, and 2 Hackmanite instead if you did not read the evidence inside Dead Tree. (This may be currently bugged, as it is possible to get the lesser reward even with all evidence.)

Holy Mission
Members of the Holy Mission will also receive on success:
 * 3x Survivor Elixir and the recipe for it, provided you did not give the evidence to Jager.

Sorobor Academy
Sorobor Academy members may hand the evidence to a member of the Academy:
 * Headmaster Raul Salaberry: Unlocks the Preferential Treatment passive
 * Sekiguchi Meiko: Removes the increased buy prices in Harmattan Market
 * Hugo Lockwell: Unlocks a private stock of Potions which he sells in packs at a discount

Failure

 * The amount of enemies in Monsoon during your final quest is increased, and the number of Guards is reduced
 * Dead Tree is permanently inaccessible