I don't know how these people know my email address, but after the (still unsolved) shenanigans of the Interesting email I received? I got... yet another email. This one was of a Google Drive document that had been shared with me to comment on; I'm going to link it here in case anyone can find out what to do with it.
If you want the diamond with the letters enlarged, I've got a separate doc with it enlarged here:
I really hope this stops or something comes of it.
As always, partials are welcome, and good luck.