[Said letter... is a complete report on what happened in Buenos Aries. (http://tfwiki.net/wiki/Tales_of_the_Fallen_issue_2) Complete with a full estimate of damages to the city, the surrounding area... and the death toll. Which is underlined.

Apparently, he downloaded the report at some point. There's nothing else to the letter, except for the words at the bottom:

"I thought you should know."]