The following reveals the items found in each of the emergency boxes in the game, so you won’t ever waste a plug on an E-Box that doesn’t have what you need.

Red E-Boxes (Ammo)

Elevator Hall:
9mm Parabellum 34
SG Bullets 10
Poison Dart 1
Intensifier 1

Main Hallway B1:
40S&W Bullets 18
Slag Bullets 10
SG Bullets 10
Poison Dart 1

Communication Room:
9mm Parabellum 17
SG Bullets 10
An. Aid 1
Multiplier 1

Control Room B3:
Grenade Bullets 3
Heat Bullets 3
SG Bullets 5
An. Aid 1
Intensifier 1

Experiment Room Hall:
Poison Dart 1
Slag Bullets 10
40S&W Bullets 18
An. Aid 1
Multiplier 1

Central Stairway:
Poison Dart 1
Heat Bullets 3
Intensifier 2
Multiplier 1
An. Aid 2

Power Frequency Room:
Heat Bullets 3
Grenade Bullets 3
Slag Bullets 10
An. Aid 3
Intensifier 1

Hovercraft Storage [Rick Ending]:
Intensifier 1
Multiplier 1
An. Aid 1