GoodROI shows us an example of a search that brings up a Google Base search box, right at the top of the main search results at Google.com. The search that should show you this Google Base OneBox result is for homes for sale.
You should see a box below the sponsored listings that looks like this;
The "location" box is filled with my hometown automatically. The clickable link, "homes for sale" takes me to this landing page.
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