Obtaining a Deadspace Overseer's personal effects is proof that you have finished clearing all major obstacles in a deadspace pocket and decimated the leading figure.

Anyone that procures an OPE (from the pirates themselves, their bases or from guarded containers) can sell them to Concord or DED for a reasonable amount of cash.

Concord has rated Deadspace Overseers by the threat they pose to society and divided them into tiers that dictate how much a seller gets for their effects.