Do you have a link for the info you supplied about the encoding number on the SS registration? I have not heard that before and would like to know more about it.
I was recalling an earlier investigation and hadn’t heard anything of it lately, guess this why.
“Registration forms created prior to the establishment of the Data Management Center had a DLN configuration different than the current format. The first three characters (089) of the DLN for this form designate that this form was key entered by one of the keying centers of the Internal Revenue Service.”