<i>"the FBI may have seized the key to that [111,000 BTC] wallet and thus gained control of the bitcoins, which they could transfer at any time to the FBI’s own wallet. “They may have the key and just be keeping them at that address,” says Meiklejohn. “That would explain what we wouldn’t have seen them move."</i><p>That would be extremely stupid for the FBI to do. If they don't immediately transfer the coins, then anybody with a <i>backup</i> of this wallet (eg. an accomplice that has yet to be apprehended) could run away with the coins, even after the wallet has been "seized".<p>So, unless the FBI is that stupid, it is almost certain that they have <i>not</i> seized this secondary wallet of 111,000 BTC.