Detective Duck Bank Walkthrough: All Codes (2026)

The Bank chapter in Roblox’s Detective Duck turns a simple robbery report into a multi-room puzzle hunt with UV codes, a rotating vault lock, and a CCTV twist at the end. This full detective duck bank walkthrough, updated for October 2026, lists every code and step in order so you can clear the chapter without getting stuck.

Detective Duck bank walkthrough guide: Detective Duck investigating the bank — Detective Duck investigating the bank

New to the game? You can play the official Detective Duck game on Roblox for free, then follow this detective duck bank walkthrough step by step to clear the Bank chapter fast.

Detective Duck Bank Walkthrough: All Codes at a Glance

Staff computer code: 4400 (some guides list 440)
Valuable Storage rotating lock: 1863
Vault keypad: 6920
Truck license plate: AA000BN (some guides show AA0BN)
Correct suspect: Mr. Sterling, the bank manager

Step 1 of the Detective Duck Bank Walkthrough: The Consultation Room Key

At the bank entrance, move the welcome mat aside to find the key to the consultation room. Head inside.

Step 2 of the Detective Duck Bank Walkthrough: The Water Tank Key

In the consultation room, read the clipboard note, then tap the clock above the doorway. A water tank key is hidden behind it. Take it.

Step 3 of the Detective Duck Bank Walkthrough: Get the Key Card

Go outside near the bank and use the key on the drinkable water tank. Inside you will find a card (key card). Use it to enter the staff-only area.

Step 4 of the Detective Duck Bank Walkthrough: Power Up the Staff Computer

The computer in the staff-only area needs an authentication stick (USB) plus a code. First grab the stick near the projected screen or board in the consultation and public area. Then shine your UV light on the screen to reveal the code: 4400. (One guide lists it as 440, but 4400 is the code most walkthroughs confirm, so try that first.)

Insert the stick into the reader next to the computer, wait for the server to connect, then enter the code. The second door into the staff room opens.

Step 5 of the Detective Duck Bank Walkthrough: Find the Storage Room Keys

In the staff room, look near the water tanker on the shelf and take the storage room keys. Open the storage room, which connects from the other side.

Step 6 of the Detective Duck Bank Walkthrough: The Rotating Lock (1863)

Use the UV light on the table in the storage room to reveal the passcode 1863. Find the door labeled “Valuable Storage” with a rotating lock. Enter 1863 by position: press 1 when the marker aligns with the red line, 8 when it stops just before red, 6 when it stops just before yellow, and 3 when it stops just before green. The door opens.

Detective Duck bank walkthrough: Detective Duck finding a key item during investigation — Detective Duck finding a key item during investigation

Step 7: The Four Books and the Vault Code

In the valuable room, take the scissors from a shelf. Go back to the storage room and cut open the cardboard boxes to find 3 red books with the digits 6, 9, and 2. Cut open one more box near the metal door in the valuable room to find a 4th book, which says the last digit is hidden in the consultation room.

Return to the consultation room and shine the UV light on the wall to reveal the final digit: 0. The full vault code is 6920.

Step 8: Open the Vault

Enter 6920 on the keypad beside the metal door in the valuable room. Inside, take the key. Note the vault itself is empty: the money was already stolen, which is exactly what you are investigating.

Step 9: The Tax Office and the Remote

In the storage room, take the staircase up to the tax office and unlock it with the key you just found. Pick up the remote next to the desktop.

Step 10: Watch the CCTV Footage

Return to the consultation room and use the remote to turn on the projector. The CCTV footage shows a truck leaving at 2:00 AM. Read its license plate: AA000BN. (One guide renders it as AA0BN, so if the first version is rejected, try that.)

Step 11: Name the Culprit

Go back to the staff-only area computer and enter the license plate. The system identifies the truck owner as Mr. Sterling, the bank manager. End the investigation and vote for Mr. Sterling to close the case. This detective duck bank walkthrough ends the same way every time: Mr. Sterling is the culprit.

If you haven’t cleared the first case yet, our Detective Duck: The Suburbs walkthrough covers it step by step, and our Demonology Roblox beginner guide is another mystery-hunting Roblox game worth trying.

Frequently Asked Questions

What is the vault code in Detective Duck Bank?

The vault code is 6920. You piece it together from three red books (digits 6, 9, 2) found in cut-open boxes and a final digit 0 revealed by UV light on the consultation room wall.

What is the staff computer code in Detective Duck Bank?

Enter 4400 on the staff computer after inserting the authentication stick. One guide lists 440, but 4400 is the widely confirmed code.

How do I open the rotating lock in the Bank chapter?

The combination is 1863, found with UV light on the storage room table. Time your inputs on the rotating dial: 1 at the red line, 8 just before red, 6 just before yellow, 3 just before green.

Who stole the money in Detective Duck Bank?

Mr. Sterling, the bank manager. The CCTV footage shows his truck leaving at 2:00 AM, and the license plate lookup confirms it is registered to him.

Bookmark this detective duck bank walkthrough for October 2026 so you can find every code again when you replay the chapter.

Axee Davies

Axee Davies is the founder of AxeeTech, publishing gaming guides, codes, and Windows how-tos since March 2013. A tech enthusiast for 13+ years — starting with smartphones and Android rooting — he now runs a site that puts out a new guide every day for Roblox players, traders, and Windows users. More about AxeeTech

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