I’m guessing you’re basing it off of this official legal correspondence, which I am including below for people who haven’t seen it:

Dear Mr. Cox:

Attached is a letter that we received on November 19, 1974. I feel that you should be aware that some asshole is signing your name to stupid letters.

Very truly yours,

CLEVELAND STADIUM CORP.

James N. Bailey, General Counsel

cc: Arthur B. Modell

It says they use publicly exposed or leaked IAM keys with RW permission to do this, in case anybody is interested in how they get in.