Here are some quick notes on Security Box Key Locations and Rewards I have found, Also to find the Security Boxes themselves they are located in the Fortune City Bank U109 inside the Vault in the Uranus Zone.
Americana Casino
Key #044: On top of one of the Square Lights, Go to the 2nd Floor of Beenie Jack's BBQ Shack to be able to access the lights.
Reward: $100
Key #083: Cashiers Room – As soon as you enter the room, it is on the counter to your left.
(Cannot be accessed until Case 4-2)
Reward: Gems
Atlantica Casino
Key #009: In the Security Office on the counter to your right as you enter the room next to a TV Monitor.
Reward: $25,000
Key #999: In the water in front of the Poseidon Statue at the main entrance.
Reward: $25,000 & Zombrex
Fortune City Arena
Key #052: In front of the Hostile Zone store E102, Behind Frank West's book signing Table.
Reward: $100,000
Key #097: In the Fortune City Arena's Security Room on the desk to your right as you enter.
Reward: $100,000
(Cannot be accessed until Case 1-4)
Fortune City Hotel
Key #673: On the floor to the left hand side, right by the doors to South Plaza.
(Cannot be accessed until Case 1-3)
Reward: Gems & Zombrex
Fortune Park
Key #185: Outside of the Entrance to the Uranus Zone, Under the left hand side Escape Pod.
Reward: $10,000
Key #304: On top of the scaffolding next to the main doors to the Fortune City Hotel on the end closest to the Platinum Strip.
Reward: Gambling 3 Magazine
Palisades Mall
Key #040: Grotto - On the ground floor of the Grotto, just behind the bar with the Blender on top of it.
Reward: $100,000
Key #045: On top of the Slot Machines in front of The Venus Touch P109.
Reward: $50,000 & a HandGun
Key #112: Trendy Cindy P113 - Behind the Cashiers Counter with the two Cash Register's on it.
Reward: 3 Remote Mines
Royal Flush Plaza
Ground Floor
Key #001: On the ground next to some Cash and a Handbag, Just before opening the doors to the main Royal Flush Plaza area.
Reward: $50,000
Key #145: Tunemakers R105 – Just inside Tunemakers Maintenance Room on the floor.
Reward: Bargaining Magazine 2
Key #666: Sturdy Package R119 – Inside the store behind the counter with the Cash Register on top of it.
Reward: $50,000
2nd Floor
Key #203: Albert's Apparel R201 – On top of Albert’s Apparel sign, Use the red telephone booth by Players R213 to climb up and access it.
Reward: $50,000
Silver Strip
Key #690: Hot Excitorama N110 – It is found on the CD Rack behind the Cashiers counter.
Reward: $50,000 & a Massager
Underground
Key #015: The Underground – On the detached train section that is outside the Phenotrans Harvesting Area main door.
(Cannot be accessed until Case 3-1)
Reward: $50,000
Key #329: The Underground - In the Centre of the Underground, where the 3 routes meet on the floor next to the Ramster Ball.
(Cannot be accessed until Case 3-1)
Reward: $100,000
Uranus Zone
Key #764: This one is a little Hard to describe so I am looking into making a video for it.
Reward: Six Shooter
Security Box Key Locations
