Mouse PI For Hire The Things We Keep is a side job from Wanda Fuller. She was expecting a reply from a screenwriter, but never heard back from them.
Let’s see where you can find the letter to Wanda!
How to Start and Complete the Mouse PI For Hire The Things We Keep Side Job
The side job becomes available once you start the main job “Once Upon a Time…” By Tinsel Bros. Before going further with the main quest, head to the PI Office and speak to Wanda Fuller.

Similar to other side jobs, this is a missable side quest. Completing the main job before finishing the side job will lock you out of it. You can safely progress through the main mission until you arrive at the theater and start the Find the Pyrotechnist sub-objective.
Where to Find the Letter for Wanda
The objective of The Things We Keep side job is to find the Letter for Wanda. Take out all the enemies in the theater and make your way to the final room. The item can spawn in different locations in this area.

Search the bookcase and collect the letter from the bottom shelf.

The Letter to Wanda may also appear behind the bar.

If the letter is not in the bookcase or behind the bar, exit the room through the door on the left, turn left, and check the floor. The Letter to Wanda may be next to the crate.
Once you collect the letter, return to Wanda Fuller to complete the side job and receive 150 coins as a reward for helping Wanda.
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