I've patiently clicked on a few years worth of archives "report as
spam" message per message, but I've run out of steam after doing
December 2005 and have stopped going into older messages.

I've found *one* non-spam message since December 2005, that is
https://lists.debian.org/vgui-discuss/2006/01/msg00019.html

Final Notice.

You are among the beneficiaries of 2024/2025 grant for all scam victims and relatives reconfirm your email if active for more details

Thank You.

Regards
Mr. Rowland Cole
( Financial Crimes Enforcement Network)