Secrets on this map: -- FEEDING THE HELLHOUNDS GIVES YOU HELLS RETRIEVER TOMAHAWK - SECRET FOUND AND REVEALED HERE -- "Rusty Cage" - Hidden Song By Johnny Cash -- Sniper Trap Upgrade -- Hidden Blundergat and Spoon Melee Weapon
Map Layouts: -- Shower Room -- Ground Floor -- Michigan area ground floor -- Michigan Area 2nd floor layout -- Cafeteria Area -- Citadel Tunnels layout from Wardens Office to shower room -- Infirmary layout and access to Gondola -- Roof Layout -- Docks Area
here is the ground floor Michigan area which contains the briefcase part, one of the power switches that must be electrocuted to be activated and the fan trap that needs power in order to be active.
I used the afterlife panel and killed myself, turned into the ghost and electrocuted the electricity panel, the cell door holding the X2 points multiplier opened and I was able to pick it up, which is just to the left of the switch.
Here is the map layout in two parts below and the location of the part under the stairs, as well as the wardens key which sometimes spawns just outside his office along with a video of how to get it down:
Michigan Area part 1: