This is a Station Vault. It is fitted with a password-protected security lock and computerized inventory auditing. Although the construction of a Station Vault is much like that of other Cargo Containers a Station Vault is far too big to fit in a ship's cargo hold and is only used for storage and inventory management at stations.
Station Vault
Cargo containers allow for extra storage while either being deployed in space, inside a cargo hold, or inside a station.