Grade 5 Credit Case

Grade 5 Credit Case is a premium grade 5 credit lockbox. Upon use, these boxes award credit 476-874.

Source
Grade 5 Credit Cases can be obtained through the Crew Skill Slicing. They can be harvested on Voss from Biometric Safe Boxes, which requires level 250 Slicing, Cybernetic Supercomputers, which requires level 295 Slicing, or from Grade 5 Slicing missions.