[deafsquid69]

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]

That’s true, but if someone bought the keys, then they’d be more likely to start moving/spending the coins.

[anonAndOn]

How to dodge transaction fees and internet sleuths in one pass: Put a bitcoin in a wallet and sell the wallet.

[Cantinflas]

How could that work? If I sell you a private key, then you get the private key, and I get the money... and the private key. You either move them right away or risk me moving them (or me selling the private key again to another guy)