Only spent about 6 hours at the "camp" but I did not come across this.

I dont think the circlet was nerfed because of Sullon but rather the other 3 pvp servers that existed long before.

Started a comprehensive list on the wiki:

http://wiki.project1999.org/index.php/Removed_Items

missing anything? any additions for Velious+?

Circlet of Shadows is incorrect:
http://www.tski.co.jp/baldio/patch/20010627.html

"Circlet of Shadow will no longer drop in-game. The Circlet of Shadows, can now be found in its place. This item differs from the original only in that it has a five-second casting time. Existing Circlets of Shadow will retain the same functionality as before, though we may change existing Circlets at some future date."

June of 2001, roughly 6-7 months after VELIOUS release. I'll update the wiki for ya ;)