If you right click a google ad, you could look at its source code and search for your Google Adsense ID.  The way our ad sharing works is that randomly half the time the page shows your Adsense ID, and the other half the time it shows our Adsense ID.  The pages are cached on our server and only refreshed every hour, so you won’t see the alternation if you keep refreshing the page.  Also remember that you must have a minimum of 30 trends for ad sharing to take into effect