Oh my little buddy---i hand delieverd them to him and his partner as well---a couple of years ago. The threats were of serious retaliation to keep my mouth shut.
Son---it is a little bit beyond your pay grade to understand.
You want to try to make me understand? I can come to you in person or invite you to my office or home. You will be surprised how close I am to you. Also bring your paycheck and we can compare pay grades.
Anyone can send their advice to anyone and people do it all the time. You could send it your Congressman, to the White House, the Kremlin, the Queen of England or even the Pope but it doesn't mean anyone takes it seriously. As far as retaliation is concerned, you are not that important that anyone will waste time and effort to retaliate against you. You are imagining things or making up things to make yourself feel important. Again all signs of a simple mind.