What are the Dark Overlord 9/11 documents?

"On New Year’s Eve, Motherboard broke the news that a hacking group known as The Dark Overlord was threatening to release a cache of stolen insurance and legal documents related to the 9/11 attacks. After distributing a small preview set of files, the group has now publicly released a decryption key for more files, meaning anyone can download and read them"
https://www.vice.com/en/article/kzvv7m/the-dark-overlord-decrypts-more-911-insurance-files

"The Dark Overlord hacker group has released decryption keys for a second batch of 9/11 documents, totalling over 7,500 files. Additional document leaks containing “more secrets” and “more truth” have been promised, for a price."
https://www.rt.com/usa/448416-hackers-leak-more-911-docs/

"The Dark Overlord hacker group, known previously for leaking episodes of Netflix’s Orange is the New Black, has claimed that they hacked insurance companies connected with 9/11 litigation and will release the information if they aren’t paid a Bitcoin ransom"
https://heavy.com/news/2019/01/dark-overlord-911/

"Notorious hacking group The Dark Overlord is threatening to leak what it claims are highly-sensitive documents relating to the 2001 September 11 attacks. It says it will publish the material capitalizing on various conspiracy theories around the 9/11 attacks unless its ransom demands are met."
https://www.forbes.com/sites/kateoflahertyuk/2019/01/02/hacking-group-the-dark-overlord-threatens-to-leak-sensitive-911-documents/#1e91612c4313

"they had hacked New York-based real estate developer Silverstein Properties – one of the companies mentioned in 9/11 conspiracy theories – along with insurers Hiscox Syndicates and Lloyds of London, among several other insurers and legal firms."
https://nakedsecurity.sophos.com/2019/01/03/dark-overlord-hackers-release-alleged-9-11-lawsuit-documents/

"The group has since received several payment to their bitcoin wallet, up to 17 transactions have occurred and about 3.27 BTC has been received, which equals around $12,500 dollars. The Dark OverLord also began to sell the documents on the Twitter handle, @tdo_h4ck3rs; this account has since been suspended.

Since the groups accounts were suspended from Twitter, Reddit, and Pastebin, they have begun to upload the documents to Steemit."
https://lifars.com/2019/01/the-dark-overlord-releases-9-11-related-documents/

"Hacker group the Dark Overlord claims to have stolen 18,000 documents from business insurer Hiscox and several other law firms involved in litigation surrounding the September 11 attacks"
https://www.newsweek.com/911-911-hack-documents-conspiracy-hacker-dark-overlord-ufo-1277431

"The Dark Overlord, a hacking group known for breaching entertainment companies and harassing U.S. school systems, said Wednesday it released “a small sample of documents” to verify prior claims that the group breached international firms. In a Dec. 31 Pastebin post, the group said it hacked New York-based real estate developer Silverstein Properties along with insurers Hiscox Syndicates and Lloyds of London to find sensitive security information tied to the 9/11 attacks."
https://www.cyberscoop.com/the-dark-overlord-9-11-documents-hiscox-lloyds-of-london/

"After receipt of $12,000 in Bitcoin, the group released “Layer 1”—the first of five successive groupings of documents it promises are increasingly more damaging to the U.S. Deep State. This first dump includes 650 documents out of roughly 18,000 that were reportedly stolen in April."
https://www.trunews.com/stream/dark-overlord-hackers-release-layer-1-of-stolen-911-docs

"Through Twitter, the hacker group claimed it hacked three of the world’s largest insurers and will be “providing many answers about 9.11 conspiracies through our 18.000 secret documents leak."
https://mysteriousuniverse.org/2019/01/dark-overlord-hackers-threaten-leak-of-thousands-of-secret-9-11-documents/