Anonymous 10/10/2019 (Thu) 16:03:56 No.14001 del
>>13993
>>13998
(and others)
Found this letter of the state department's OIG (pic) as an enclosure in a report (page 6).
Link: https://www.stateoig.gov/reports/10464

Resembles it pretty closely, I would say, but am of course no expert neither in fonts, nor letter heads.