From Team Fortress Wiki
The mysterious treasures were crafting items that were added in the June 19, 2012 Patch. On the Pyromania Update, they were incinerated into small ash piles or otherwise visibly unaffected. Prior to the July 11, 2012 Patch four ash piles could be crafted together to form a Pile of Ash. Following this update, all of these items, with the exception of the Fireproof Secret Diary and the Barely-Melted Capacitor, were removed from the game.
- Goldfish (Roasted Goldfish)
- Pocket Lint (Charred Pocket Lint)
- Cheese Wheel (Smoked Cheese Wheel)
- Banana Peel (Burned Banana Peel)
- Barn Door Plank (Incinerated Barn Door Plank)
- Secret Diary (Fireproof Secret Diary) — not an ingredient for the Pile of Ash
- Damaged Capacitor (Barely-Melted Capacitor) — not an ingredient for the Pile of Ash
As a crafting ingredient
|Mysterious Treasure||Pile Of Ash|
- Added the Mysterious Treasures to the game.
- All ash-related items have been faded away to dust.
- Along with Scorched Crates, Piles of Ash, and Scorched Keys, players who have obtained this item but have not opened Team Fortress 2 prior to the July 11, 2012 Patch will still have this item listed in their inventory while trading. If traded to a person who is currently in-game, that person can use the items as normal until he restarts the game.