Yes, instant lottery tickets do have serial numbers on them (partially to avoid fraud). They are designed specifically for situations like this, so if they are lost or stolen they can be reported and the tickets will be tracked. So if you stole the tickets from a store, they could just report it and prevent you from being able to redeem the money (maybe even the ones that are low enough to cash at stores, but I am not sure about that part). However, I suppose you could try and sell them to people on the street since it would be pure profit for you.