Reinforced Small Credit Box

Reinforced Small Credit Box is a standard class 3 lockbox. Upon use, these boxes award credit 334-530.

Source
Reinforced Small 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.