[My 10 sites (pr2) gone in the google sandbox. Did my page rank go to drop? How can we remove our website from Google sandbox?]
You are just not getting it. Since the so-called “Google Sandbox” only exists in your mind, Google has no idea that you are in it. Therefore it cannot have any impact on your AdSense status.
Now if you do something foolish, as a reaction to this condition that only exists within your imagination, then you could end up jeopardizing your account. Just stick to solid SEO and promotional efforts and you’ll be fine.
Focus on attracting targeted traffic and help your advertisers get sales and you let those “sandbox” theories fade away.
For the true believers of the Google Sandbox I offer the following SEO prayer:
Thou preparest a ranking before me in the presence of my competitors;
Thou annointest my website with traffic; My hits runneth over.
Surely Googles and mercy shall index me all the days of my life,
and I will dwell in the SERP of the Google index forever.