You actually want to use "authorid", this will show you better results. In order to accomplish this, you need to find your "authorid". Here it is from the horses mouth:
How can I see all of my published items?
To see your items in Google Base search results, log in to your Google Base account and select the Active items tab. You may see a link titled View all searchable items to the right of the Display number of items per page drop-down menu. Clicking on this will direct you to a Google Base results page listing all of your published items.
If this link isn't displayed in your dashboard, please use the following URL instead:
[base.google.com...] author ID]
Replace [your author ID] above with your actual author ID. To get your author ID, post an item to Google Base, and then view the item page. The author ID is the number appearing after the /a/ portion in the URL of the page. For example:
In this URL, the author ID is 1025415.
Please remember to delete your item after you've noted your author ID, if your item serves no other purpose.