Locating the Family Garage Safe Key
The Family Garage Safe is situated in the Bel-Air district, inside the garage of Curtis Sinclair's mansion.
To open this safe, you must first obtain the Family Garage Safe Key. This key is dropped by a specific named zombie.
The zombie you need to find and defeat is Curtis's Valet. He is a unique Screamer variant.
Curtis's Valet can typically be found wandering the driveway area or the gardens surrounding Curtis Sinclair's mansion. He may spawn after you have progressed through the main story quests in Bel-Air or after clearing the immediate mansion area and then revisiting. Once defeated, he will drop the Family Garage Safe Key.
