That's not from a Reuters news story; that's from an op-ed by a former State Department employee that Reuters syndicated in 2016 shortly after the Comey press conference.
The writer seems to have read "From the group of 30,000 emails returned to the State Department, 110 emails in 52 email chains have been determined by the owning agency to contain classified information at the time they were sent or received" and took a big leap on the jump to conclusions mat that 100 emails with classified information meant that classified documents were being verbatim transcribed (retyped) from one system to another.
From the DOJ report, the actual number of emails that contained verbatim transcriptions of classified documents was 8, on 3 e-mail chains, all Confidential, all of them sent by Clinton aides who CC'ed her. The report does not say one way or the other whether the paragraphs were copied from classified e-mails or from printed documents they had at their disposal. So again, the actual number of classified documents deliberately moved (whether by re-typing or someone using removable media the wrong way) from classified network to unclassified network that we know about... as far as I've been able to find... is zero.
Your op-ed seems to make much of the markings that were on the e-mails when they were sanitized/released to the general public by the State Department FOIA people, which if one were just reading the op-ed and didn't know better would make you think those markings were on a source document that the emails were quoting as opposed to applied retroactively. (Obviously neither a lack of marking nor a classified fact being in one's brain or communicated verbally before being written down--as opposed to copied from another written source--changes the obligation to appropriately protect that data. I'm simply pointing out that without them it's one less data point DOJ has to show willfulness/knowledge/intent.)
I agree. Who did that, when, and how do we know it?
I'm quoting a report that cites its sources written under the auspices of a bunch of Republican DOJ appointees that hammers the previous FBI director, also a Republican, for his missteps investigating Hillary and leading the Bureau, and was written by the same IG that hammered Bureau leadership for playing dirty going after Trump aides. It has no discernible reason to pull its punches on HRC. You're quoting an op-ed from a guy who was long gone from the USG and had no connection to the investigation or insider knowledge of the details, who doesn't show his receipts, who seems to have done some good work in his career but also left USG service with his own classified disclosure issues. (Not saying he was doing a hatchet job in his op-ed, just that it was a hot take based on the limited information available at the time and he got out over his skis a little bit.)
793(d) and (e), 1924, and 2071(a) require an element of intent. 793(f)(1) and (2) don't explicitly require intent but haven't historically been charged without it:
Note that the only charge considered in the Clinton case that overlaps with the MAL docs case is 793(e), and in this instance the SC has Trump dead to rights on knowledge and intent (via audio and video tapes, text messages, and his lawyers records) to willfully retain.
I definitely think she *could* have been charged on 793(f), but it would have been in an Alvin Bragg "You could make an argument that the statute works this way... It just hasn't been done before" kind of way... Not IAW DOJ charging guidelines that essentially require a guaranteed win. And I 100% agree with you that all of the staff flunkies should have lost their clearances and (like her) never sniffed the inside of a federal office building again.