Not many people traded Bitcoin at that time, even trade, they did it privately without anyone know. And, I am really sure if any, he didn't tell it to here if bought it in 2010 and still saving it right now. Because humble people won't tell their treasury to the public, they won't tell how many bitcoins they have on the forum. That's why we can find many bitcoin mixers exist here because ordinary people use that for save their treasury privately without anyone know to track it.