The former National Security Agency contractor suspected of stealing U.S. hacking tools allegedly was found hoarding two decades’ worth of classified materials.

In a Thursday court filing, federal investigators provided new details on their case against 51-year-old Harold Martin, who was arrested in late August. Investigators have seized 50 terabytes of information from Martin, in addition to thousands of pages of documents, the filing said. Among them are classified operational plans against a known enemy of the U.S that Martin had no need to know about.