... and it says;
Sorry, we couldn't find that!
You do not have permission to view this forum.
What has actually happened to the post? Is it spam, really dangerous information that shouldn't get out, or what? Does it really go to a forum only Mods can view and laugh over??
You deserve a simple, direct answer to your questions.
In the first situation (sorry, we could not find...), one of several things has occurred. The post has been deleted, sometimes at OP request, sometimes because it was a duplicate, sometimes because it's spam. Or...the post may have been merged with another existing topic/post by same member.
The "you do not have permission" applies simply because there are all sorts of forums here and members do not need access to all of them. All are administrative in nature and would be of no interest to a member participating in a forum...although I suspect that they might make good fodder for Gen Chat . Examples would be BC malware instruction forums, topics which have raised questions that need to be reconciled by Staff, and spam topics/posts.
Now that you know the "secret workings" of BC...the next time that you see one of those two situations, you will have a better understanding of what might be going on and why we don't encumber members with access to such. It's very unexciting, very uninformative...of no value to anyone outside BC Staff.
Good luck with your topic .