The keys can move without the coins moving. Think of it like the ultimate Casascius coins. There's no way to know whether or not Satoshi cashed out. I can't find the thread, but I'm pretty sure Adam Back even said this on bitcointalk and said that that would be how he'd move the money if he were Satoshi.
mbreese|4 years ago
anonAndOn|4 years ago
Cantinflas|4 years ago