'Following Orders' Lockbox Code Location in Modern Warfare 4

In Call of Duty: Modern Warfare 4's "Following Orders" mission, the lockbox in the small side bedroom of the first family's house requires a code to open. The mission casts you as a North Korean soldier hunting a defector and forcing you to threaten innocent civilians. It is the only locked container in the mission, and getting its contents makes extracting information from the husband much easier.