One Easter egg includes gaining access to a locked vault, which contains free randomized loot items, requiring players to explore and decipher hidden clues.
The combination needed for the vault is scattered on hidden notes found around the map. You'll need to find all three notes, each giving two numbers for the code.
The vault is inside the map's bank point-of-interest called 'Savings and Loans,' and you can access this location by starting from the left or right side map barrier.
Once unlocked, players can enter the vault at any time to loot it, gaining a 40-second safe window from zombies.
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