Right, but if you filter your search back further in time, you get a whole 'nother set of 200.

If you post 200 posts every month, then an open search is only going to give you the most recent 200 posts for this month and you won't see anything older. If you filter your results for "older than one month", you will see up to 200 posts you made last month. That's what I was getting. Doesn't fix the problem, but gives you an interim solution.
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John