Putting the site-delimiting string into Apple's internal search function won't work. It's possible you added a space or other extra character. Paste this:
site:discussions.apple.com buzzoff13
into a search engine's url window. It worked for me in Yahoo search and returned a number of hits. Things to note:
— There is no space between the colon after "site:" and the "d" in "discussions."
— Some search engines may require that your username be inside quotes:
site:discussions.apple.com "buzzoff13"
I guess my question now is why aren't the posts listed under my account if they aren't deleted or removed?
Fair question, but we are neither moderators nor Apple employees. We can only report based on our observations and experiences. The Mods have not shared a reason for limiting how many post appear using internal search.
You can contact the Mod team. There is an email address in the forums Terms of Use document here: Apple Support Community Terms of Use