MOUSE: P.I. For Hire Guide | All The Bookkeeper By Tinsel Bros Collectibles
Here’s a guide on how to get all the Bookeeper By Tinseld Bros Collectibles in MOUSE: P.I. For Hire.
Game Guide by Ragib Rawnak on Apr 20, 2026
Finding all the items in The Bookkeeper by Tinsel Bros requires you to explore every corner. Many of these items are hidden behind objects or in caves. Use this guide to make sure you do not pass any of them.
The Office and the Broken Building
Once you use the Bookkeeper’s Key to open the door, walk inside. You will find a Newspaper sitting on the chair where the Bookkeeper was just located in MOUSE: P.I. For Hire.

Later on, you will fall through the floors of a building multiple times. When you stop falling, look to your right and smash the crates. This reveals a cave. Go inside and open the safe to find a Schematic.
Trains and Shelves
After you climb past the train, enter the building. You need to jump onto the locker and then jump again to reach the balcony. A Comic is waiting for you on the shelf there. Keep moving until you jump onto a metal beam that carries you toward another train.
Go through the train, but do not go up the ladder yet. Instead, jump over the box on your right. You will find a Baseball Card lying on the ground.

Graves and Hidden Paths
Once you finish the train film scene and step back outside, turn your head to the left. You will see a grave. Walk behind the rocks sitting behind that grave to find a Baseball Card. After you pick up the Bookkeeper’s Letter, look to your left.
You will spot a safe far away. Walk onto the wooden platforms and shoot the targets. This lowers a hook that lets you swing over to the safe. Open it to grab a Schematic in MOUSE: P.I. For Hire.

The Final Cave
Do not leave the cliff area yet. Look at the side of the cliff for a small hole. You can jump into this opening to find a hidden cave. Inside, a Schematic is pinned to the wall. This is the last item for this section.
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