Reinforced Medium Credit Box

Reinforced Medium Credit Box is a premium class 3 lockbox. Upon use, these boxes award credit 827.

Source
Reinforced Medium Credit Boxes can be obtained through the Crew Skill Slicing. They can be harvested from Computer Terminals on Tatooine and Alderaan, which requires level 125 Slicing, or from level 25-32 Slicing missions.