Thanks Kevin for clarifying - by the way, I can’t find any User Guide for the forum other than the webmaster “install, maintain etc” at http://ellislab.com/expressionengine/user-guide/modules/forum/index.html, where the feature descriptions are more about the backend UI, not the actual “front-end” - do you know if this exists anywhere, or is it expected to be intuitive?
Sounds like I might need to use direct access to the sql db to search for the closed threads (that are Announcements) - I would have thought that Super Admins should be able to see Announcements even if they are closed (somewhere) but that sounds like ti is a limitation and needs to be suggested as a feature.
Thanks for the help in any case 😉