No, someone tweeted a letter that claims that such documents exist.
Nobody important, just a congressional subcommittee tasked with investigating the pandemic. That's all.
I'm not commenting on the veracity of it or not... just making sure to call out that a tweet of a letter is not the same thing as the documents themselves. The letter even says as much - that we need the content to be opened to the public.
With the massive misinformation campaigns that are ongoing in our world, is important to be sure people dig all the way down to facts, and don't just accept tweets at face value.