Up until block number 338060 the presumed theft address 1L2JsXHPMYuAa9ugvHGLwkdstCPUDemNCf has kept it's output coins in a closed system. By closed system I mean that if you trace all input coins repeatedly every coin would pass through a 1L2Js address eventually. The first address to break the pattern is 15wsXq5uSe2aT5BssLvQehUAQVn525RH25. First we need to be careful of false positives, to make sure we are not just reporting someone tagging an involved address with 666 bits. So here is the "heratige" of the 15wsX coins:
8328a2 contains 13 inputs from the 1L2Js address associated with the theft. The gathered amounts are then peeled off until we have two 1BTC amounts in the 15wsX address.
Quick sidebar: note that even though the entire source of the BTC can be traced back to the hack, we cannot presume the controller of 15wsX is the same as the controller of the theft coins. It is very easy for each of those peel chain steps to be the deposit to another party willing to buy hot bitcoins. There were 5 places in this chain where it could have happened, so it is a possibility that cannot be dismissed.
This part of the chain is where the external linkage happens. For clarity I will only show the 930ae0 transaction, but the b52316 is functionally identical.
This may be a transaction only designed to test the waters for identification, but I think it is safe to say the thief intends to sell or spend the proceeds of the theft, if they haven't done so already.