Checked it again. It was only e-mails from Blumenthal to Hillary. I am posting from a phone and can’t make a link, but the article comes from google with search ‘rt 2013 hillary blumenthal’.
I’m generally not a big fan of Zero Hedge, but the article at ZH at the link below contains the screenshots of Blumenthal’s inbox which seems to contain at least one message not released by the State Dept., presumably because it contains such highly sensitive information that it could not be revealed even in redacted form. So, Blumenthal clearly had access to very sensitive material that he received from highly placed sources.