Are you trying to discover what File Cabinet Keys unlock in Blue Prince? You might stumble upon these items while exploring the manor, though there are very few hints to go by. Our guide has the information that you need, but be forewarned of minor spoilers ahead.

Where to find and use File Cabinet Keys in Blue Prince - File Cabinets guide

So far, we've found three File Cabinet Keys in our playthrough. They tend to unlock various containers all over the estate. As usual, our guide discusses clues and hints first, before we mention the exact locations and the expected rewards.

File Cabinet Keys #1 and 2: Clues in the Aquarium

Clues regarding two File Cabinet Keys in Blue Prince can be found in the Aquarium. However, you can only see them once you've fully drained the water using the Pump Room. Note that you might need to activate the Boiler Room as well just to make use of the reserve tank.
In any case, the aquariums show dioramas of rooms in the mansion. Two of these have floors marked with an "X" symbol.

File Cabinet Keys #1 and 2: Locations

The rooms that you need to visit are the Patio and the Laundry Room. Oh, and you also need to bring a Shovel with you. You have to face the correct spot on the ground just to see the dig icon for your Shovel:
Patio - In front of the left-hand side of the barbecue grill.
Laundry Room - There are three washing machines to the right. The correct spot is in front of the middle one.

File Cabinet Keys #1 and 2: Which drawers do they unlock?

Now that you've dug up these items, it's time to figure out where to use the File Cabinet Keys in Blue Prince:
The clue itself comes from the Safehouse, which can be accessed once you fully drain the Reservoir.
One of the documents points to a set of terminals resembling the ones from the Security room.
If you look closely at the CCTV footage, you'll notice that it points to a specific file cabinet in the Archives.
In any case, go ahead and bring your File Cabinet Keys to the Archives and unlock the corresponding drawers:
The Patio key opens the bottommost drawer, which has an Upgrade Disk and a birth certificate.
The Laundry Room key opens the drawer just above that.
The documents here have cryptic clues, though there are those related to the Sanctum Sigil Puzzle.

File Cabinet #3: Location

For the third File Cabinet Key, you'll want to head outside the manor to spot the dark tunnel that's filled with crates:
Early on, you can bring something that could light torches to pick up the Tunnel Floorplan.
Then, once you've completed the Laboratory Puzzle, you can collect all three Microchips. If you place them in the Sundial, you'll be able to download a data packet that has new laboratory experiments.
Use the new experiments to remove crates in the tunnel.
After removing a dozen crates or so, you should see a wooden box that has been left behind. Go ahead and pick up the third File Cabinet Key from the box.

File Cabinet #3: Which drawer does it unlock?

This particular key opens a drawer in the Underground. To be more specific, it's in the foreman's well-hidden office near the Rotating Gear Puzzle. It's the one that connects the Rotating Gear and the tunnel with the mine cart. Similar to the others, it also contains a document for yet another riddle.
That does it for our guide on where to find and use File Cabinet Keys in Blue Prince. We'll keep you posted if we discover others, so stay tuned.
A surreal adventure filled with wonders and mysteries await you in Blue Prince. If ever you feel stuck or lost at any point in time in your playthrough, don't forget to check our Blue Prince guides hub.

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Where To Find And Use File Cabinet Keys In Blue Prince