Preferred Member from GB
joined:July 25, 2005
If you're referring to the latest GWT glitch that saw many websites "double" their size overnight (happened mid January), there's no way of confirming as to what really happened.
There are no known commands to type in Google to "unlock" the supplemental index (mind you, I'm not saying there is such index!) or a different tier of the index, but with a bit of creativity, you can find pages that may contain thin content.
Here's an example. I was recently looking at a Pandalised site, however, the site:example.com query didn't yield any pages with thin content.
Then I browsed around randomly and stumbled upon a page that contained only an image and this string of text: "Click on the image to reveal a larger size"
Next, I used this query:
"Click on the image to reveal a larger size" site:example.com
and voila! it showed me it had 200+ such pages in its index. Funny, when I did just site:example.com it didn't show a single page of that type.
Now if I were to try to rescue the site, I'd simply remove those pages or "noindex" them.
Another possibility is that each of your page has got two different urls.
However, most likely, Google doesn't give you the precise number of pages it's got in its index.