Some quick digging around: not much to be found on the wallet addresses on the extortion letters. One wallet was tied to a 0.001 transaction on 6/27.
wallet: 17gt1BancvtnnJwy4BA41VBUH3pfbUvzE block: 308079
wallet: 17gt1BancvtnnJwy4BA41VBUH3pfbUvzE block: 308079