I just answered this question a few posts back. The answer: Nothing is automatically granted to you. Collectively, people, in recognition of a uniformly applied set of laws, and by the power of a state, will grant you specific rights dependent on what ownership rights you have been given for some specific type of thing. This will be different if it is a dog, a sofa, a parcel of land in California, a nuclear bomb, or your thumb. Regulations and laws are key here. I suggest you don't beat or abuse your dog. And I suggest you don't chop down oak trees on your parcel of land in California.
So you're saying that other people grant me ownership of my thumbs as well as my thumb drives? How exactly is that an argument that they are different? That sounds like you're saying they are the same.
You asked for a difference. You got a difference. Is there something else you are looking for?
So there's a difference because society says there is, brilliant argument.