Being tech-savvy is only a small part of it. Anybody who knows how the US legal system works should understand that there's no way they'd be getting a letter f

Being tech-savvy is only a small part of it. Anybody who knows how the US legal system works should understand that there's no way they'd be getting a letter from the FBI encouraging them on behalf of a buyer to ship a product. And anybody with an elementary school grasp of the English language has got to recognize that whoever wrote that letter is certainly not an FBI official, and probably not even a native English speaker.