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.
: 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.
: Cashiers Room – As soon as you enter the room, it is on the counter to your left. (Cannot be accessed until Case 4-2)
: In the Security Office on the counter to your right as you enter the room next to a TV Monitor.
: In the water in front of the Poseidon Statue at the main entrance.
: $25,000 & Zombrex
Fortune City Arena
: In front of the Hostile Zone store E102, Behind Frank West's book signing Table.
: In the Fortune City Arena's Security Room on the desk to your right as you enter.
: $100,000 (Cannot be accessed until Case 1-4)
Fortune City Hotel
: On the floor to the left hand side, right by the doors to South Plaza. (Cannot be accessed until Case 1-3)
: Gems & Zombrex
: Outside of the Entrance to the Uranus Zone, Under the left hand side Escape Pod.
: On top of the scaffolding next to the main doors to the Fortune City Hotel on the end closest to the Platinum Strip.
: Gambling 3 Magazine
: Grotto - On the ground floor of the Grotto, just behind the bar with the Blender on top of it.
: On top of the Slot Machines in front of The Venus Touch P109.
: $50,000 & a HandGun
: Trendy Cindy P113 - Behind the Cashiers Counter with the two Cash Register's on it.
: 3 Remote Mines
Royal Flush Plaza
: On the ground next to some Cash and a Handbag, Just before opening the doors to the main Royal Flush Plaza area.
: Tunemakers R105 – Just inside Tunemakers Maintenance Room on the floor.
: Bargaining Magazine 2
: Sturdy Package R119 – Inside the store behind the counter with the Cash Register on top of it.
: 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.
: Hot Excitorama N110 – It is found on the CD Rack behind the Cashiers counter.
: $50,000 & a Massager
: The Underground – On the detached train section that is outside the Phenotrans Harvesting Area main door. (Cannot be accessed until Case 3-1)
: 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)
: This one is a little Hard to describe so I am looking into making a video for it.
: Six Shooter