Quest or activity
Thief's Note is obtained during a confirmed quest source.
Follow the linked quest. The source confirms acquisition during the quest, but does not identify a specific objective or say it is awarded when the whole quest ends.
READABLE
The most direct way to get Thief's Note is through Night Terrors.

Quest or activity
Follow the linked quest. The source confirms acquisition during the quest, but does not identify a specific objective or say it is awarded when the whole quest ends.
Follow the mapped pickup or quest source first; it is the most predictable route currently listed.
The most direct way to get Thief's Note is through Night Terrors.
Listed buy price is 15 Denarii.
QUICK ANSWER
Readable / lore item
ITEM DECISION GUIDE
Use verified relationships and acquisition evidence before selling. A listed sell value by itself never proves that an item is disposable.
WHAT IS IT USED FOR?
This is unresolved, not proof that the item has no later use.
Check verified uses →CAN I SAFELY SELL IT?
The database lists a sell value of 4, but no verified safe-to-sell rule.
CAN I GET ANOTHER?
Use the confirmed quest, shop, crafting or fixed-world route rather than an uncertain loot pool.
REFERENCE ITEM
A note found on a lonely corpse.
No related quest is currently linked.