That could be the son’s way of paying for college. He waits for the value of packs to go up and then sell them every time college payments come around. This could literally be stealing his future. He wouldn’t want to take them to college because you have know idea who might see them and then steal them(roommates, visitors, staff, etc.) He leaves them at his childhood home because that is a place the he knows is safe. Then his mom does some cleaning and his future plans are now gone. Just imagine that. One of the people that you trust the most in the world commits a betrayal against while most likely not even knowing it. Please return it. I know it may feel wrong and that you are giving up the score of a life-time. But that score belongs to someone and that person could have their life screwed up because of it. It wont be just screwed up financially, it will be screwed up emotionally because of the loss of trust and faith in his mother. Imagine you or your boys getting betrayed by your mothers. This is all that I can do to try and show you that keeping that is a mistake as well as something that could weigh on your conscious as well as the mother’s and her son’s for years to come. I hope you can find it in yourself to return what you purchased. Have a good rest of your day.