Also.. I've noticed some confusion from people when I've mentioned this tool.
This doesn't read auction logs.. the users must keep their WTB/WTS lists up to date. After 10 days (the # of days can change in the future..), your items will show a status of inactive (Mace of Shadowed Soul):
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Once this happens, you can simply click reactivate and the item will return in search results.
This was put in place to keep inactive items out of your searches.