The Official Letter is a diary entry that can be collected in Metro Exodus.
Location[]
Moscow: Right after you infiltrate the Cruiser, there will be a note on a desk, in the room to your immediate left.
Transcript[]
The Commonwealth of the Stations of the Ring Line
Treasury
To: Lieutenant-Colonel Taubman,
Special Mobile Strike Force
Commander
Colonel, I have confirmed the emergency remittance of 6000 mil-grade 7.62 rounds in 200 round belts as per the requisition form 764/35 you submitted, but I must remind you of the imminent consequences should this transaction not result in a resounding success. Your operations, although not devoid of certain flair and thus tending to be reviewed favorably, have been a consistent strain on our budget. The present remittance is an overdraft allowed ONLY due to the credit of trust your record has granted you, and will be scrutinized up at the nearest Board meeting.
I hope you understand that this time you positively MUST produce a satisfactory return on this investment.
Signed: Y. Voloshkovski
Treasurer