I did not find a place where to post bug reports related to forums functionality.
When I perform a search in ONI forums, it does not return me hits from archived posts. That means I only have chance to find old but often still useful designs using Google.
For example searching for Author = Kasuha, search string = "contraption" returns me two hits, but does not return me this post:
even though I have all options set to "return everything".
Search for archived posts and comments