Reinforced Medium Credit Case

Reinforced Medium Credit Case is a premium class 3 lockbox. Upon use, these boxes award credit 661-1098.

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