What can I do with the bank vault?

For safety reasons, there is no way to open it from within the bank itself.

Come back after you've successfully opened the vault door.

After the vault door is open, you will need to know which box to open.

The hint to that is on the DESK in the bank.

You will also need a KEY.

The key is elsewhere. A VOICE MESSAGE from your ally will give you more information.

Come back after you've heard the voice message and found the key.

Use the key to open box 22 in the bank vault.

Press the red button in the box to open a secret panel on the empty wall of the vault.

Enter the correct password for the safe and take what's inside.

Don't forget to also grab the bag of pennies from the table before you leave! As the sign says, they're there for you to take.