I'm puzzled how this is not a confession that he, Hur, was really reading too much into two file folders the FBI found in a box in Biden's garage.
Indeed, that's what two bizarre chapters in his story are, Hur the novelist, spinning a story about this box because, he admitted much earlier, this is the best he's got.
The only other retained documents he even considered charging were Biden's diaries, which Biden seems to have kept under the Presidential Records Act's exclusion of diaries from the definition of Presidential Records (though Hur included a picture of Biden taking notes in one of these notebooks during a key meeting in the Situation Room, so that notebook, at least, was a Presidential Record).
To sustain his claim that those notebooks represented willful retention that he couldn't prove, Hur got in a squabble about the precedent set by Ronald Reagan's diaries, which similarly included classified information, but which weren't charged even after they bcame key evidence in the Iran-Contra investigation. Biden had a precedent to rely on, and so Hur didn't charge.
So left with only the box in the garage to appease the Republicans, Hur worked backward from this reference in a conversation Biden had with his ghost writer in 2017, the 66-word utterance on which he built a 388-page report:
"So this was--I, early on, in '09--I just found all the classified stuff downstairs--I wrote the President a handwritten 40-page memorandum arguing against deploying additional troops to Iraq-I mean, to Afghanistan--on the grounds that it wouldn't matter, that the day we left would be like the day before we arrived. And I made the same argument ... I wrote that piece 11 or 12 years ago." [my emphasis]
Only Hur didn't call it a 66-word utterance. He called it an 8-word utterance, repeating those bolded eight words 23 times in the report without mention of the 40-page memorandum that Biden mentioned in the same sentence. Only once did he provide the full context.