Gilded Large Credit Box

Gilded Large Credit Box is a prototype class 4 credit lockbox. Upon use, these boxes award credit 2656-3698.

Source
Gilded Large Credit Boxes can be obtained as a mission reward or through the Crew Skill Slicing.

Slicing
They can be harvested from Holographic Microcomputers on Alderaan, Balmorra (Republic), and Taris (Empire), which requires level 205 Slicing, or from level 33-40 Slicing missions.