How to Break into the City Mash-up Bank Vault
You can get into the deepest part of the vault without breaking any blocks!
Q: Where is the bank? A: When you first spawn into the world, turn around and you'll see the Everbloom Studios offices. The building to the left of that is the bank. (The entrance coordinates of the building are 1641 68 -588)
Q: Where is the vault? A: You can access the bank vault by going behind the front desk and taking the door on your right. Follow that down to the basement.
Q: How could I figure out how to open these locks without this guide?
A: Everything you need to unlock the vault is hidden throughout the bank building. You don't need to leave the building to solve any of the puzzles.
Lock A
Hint 1: You'll need to place an item in that item frame. But it has a special name. The name looks like random numbers and letters. That's an "encryption key." You'll need to find one.
The "encryption key" is located on the ground floor.
You passed a chest of "encryption keys" on your way to the vault.
Take the door leading behind the front desk. Then, immediately turn left. There's a chest directly next to the door. Take one of the items in that chest and place it in the item frame in the basement. (Chest Coordinates: 1660 69 -577)
Lock B
Hint 1: What? You need a hint? It's broken.
Walk right under the door to continue to Lock C.
Lock C
Hint 1: On the left wall there are a bunch of stone buttons. This is a combination lock. The combination can be found somewhere in the building.
The information you need to solve this is located in a book titled "LOCK C."
This book is located in a chest.
Check under the staircases.
Starting from the lobby, go up the big staircase. At the top of the stairs, turn left and walk straight towards the stairs. Don't go up the stairs though! Step off the quartz stairs to the left and you should be able to see a chest underneath. Inside the chest is the book you need. (Chest Coordinates: 1669 79 -565)
There are three buttons in the combination.
"C" and "R" are abbreviations. (Bonus hint: If you're stuck, there's a sign in one of the meeting rooms that reveals what they stand for!)
"C" = "Column" , "R" = "Row"
The book contains the text "3c2r-1c4r-5c5r." This can be rewritten as "3rd column 2nd row, 1st column 4th row, 5th column 5th row." Press those buttons in that order on the left wall by Lock C. (Remember that columns are up-and-down and rows are side-to-side!)
Lock D
Hint 1: You'll need to rename a piece of paper to the special password and drop it in the hopper on the right.
You can find the special password by finding a book titled "LOCK D" somewhere in the building.
The book is located in one of the conference rooms.
One of the conference rooms is not like the others.
Enter the conference room that hasn't been named after anyone yet. It's located on Level 7. Inside there are two cabinets. The book is located in the left cabinet. (Coordinates of Book: 1648 105 -570)
Executives usually each get their own office.
The person you are looking for gets their lunch stolen a lot... At least, that's what the note by the fridge suggests.
The person you are looking for has an office on Level 6.
The person you are looking for is named "Yellow Maroon."
Is the lock still not opening? Try reading the book again CAREFULLY.
The password is "MAROON" in all caps. Rename a piece of paper in an anvil to "MAROON" without the quotes and throw it in the hopper.
Lock E
Hint 1: You have to know the combination to get through. As always, the combination is located somewhere in this building.
You're looking for a map-item named "LOCK E."
Check the kitchens.
Did you remember to check the furnaces too?
You can find the combination to open this lock by looking at the map hidden in the furnace in the kitchen on Level 5. Make the arrows next to Lock E face the same way as the ones in the picture. Then press the wooden button. Lock E should open! You're almost there! (Coordinates of Furnace: 1667 94 -568) 

Lock F
Hint 1: Don't move any of the items in the chest. You can find a hint in a book titled "Lock F" hidden somewhere in the building.
Maybe getting some fresh air will help you think.
Check the balconies.
The hint book is located in a chest on the balcony of the top floor (Level 10). (Coordinates of Chest: 1665 119 -592)
Return to Lock F. The answer is all around you.
This is Lock F. But... how do you know that?
Every other lock has an Oak Sign identifying what lock it is, but this one doesn't.
Don't touch any of the glass in the chest. Place one Oak Sign in the center slot of the chest (if you don't have one, you can break one of the signs in this room). Then press the button.
Lock G
It couldn't really be this simple... could it?Solution:
Press the button under the "Lock G" sign. The alarm will go off but fortunately it doesn't last long! You've made it! Now grab as much as you can and make a run for it!