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Can I use my own AdSense for search box?
We strongly recommend that you do not use the AdSense for search box on your site to perform searches yourself. Besides increasing the risk of accidental clicks on your own ads, searching through AdSense for search will result in reports that don't properly reflect the traffic to your pages.
We suggest that you use Google.com for your searches, or, if you're a Windows user running Internet Explorer or Firefox, we recommend the Google Toolbar, which allows you to search from within your browser, and includes shortcuts to a number of Google services.
https://www.google.com/adsense/support/bin/answer.py?answer=32851&topic=144
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