How do I know if a Dell laptop is stolen?

Hi. I was in a rush to buy a Dell Lattitude 6420 and I jumped the gun and bought a "new" laptop through Amazon.

Turns out I didn't read description and it is "new" by it's aesthetic condition, not that it's new. It's used. Once I had my mind clear I started to wonder if maybe the laptop was stolen, since the SN stickers were taken out. Something didn't seem right.

Now I'm worried. I don't want to be using something if it was stolen. How do I know if a Dell laptop was stolen?

With police I'll probably get nowhere, my local police would know nothing and I don't want to make a big deal out of possibly nothing. Does Dell have a repository of Serial numbers that report stolen? I can get the serial from the cmd prompt.