But on some of the busier subforums there are threads dated August 2010 in the archive, and you've been a member since before that. Some of smithersjones' threads have indeed been archived.
Here's the trick I just tried to find them: click on the forum's "search" button, then down in the Standard Forum Search area, type in the word "coin" for the search word, click the "Archived Posts" checkbox and type your username at the bottom, then hit the Search button. I found two pages of them.
That should find most of them, since somebody's bound to say the word "coin" in the thread somewhere. It won't allow you to search for super-common words like "the" or "a". If you're still missing threads, try to think of specific keywords that might have been used, either in your questions or in answers given to you, and search the archive for those instead.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis