Good morning Richard.
Under your "Subscriptions," I see only this post plus one about Location Services in the Apple Watch forum. But read on.
Subscriptions have been a problem since they changed the name to "Subscriptions" in a major redesign of the forums in late 2018. Starting mid last year we could no longer see posts made more than six days out. Then it started showing about three months worth. Haven't checked lately to see if it's grown any smarter because the checking alone is a pain. As your fellow end users, we have no way of knowing why this is. I can, however, provide a workaround.
The sure way to see old posts regardless of when they were made is a site-delimited web search. You would use this search string:
"Richard Setterberg" site:discussions.apple.com
The quotation marks are important, as is not using space between the colon and the "d" in "discussions."
I just used that string and, even with a cursory look, found a lot of hits including one of you posts from May 2006!
Can I burn To DVD+R? - Apple Community

So until the powers that be figure out how to tame the rogue search function for a forum serving an estimated 3 million people, the site-delimited web search is your best tool.
Allan