Where is the coa sticker in my old laptop?

Hi, 

I recently remembered i have a old laptop.(Dell vostro 1014)  Then, i opened it. And, due to some reasons i thought of reinstalling windows. But, i tried to find my coa sticker udnerside of my laptop and in the battery compartment. But i didnt found. (It is not erased) (I have oem licensed genuine windows) Can ya"ll help me find it?

Thanks, 

Mark halland