What about the entire paper trail:
a) from bank deposits/tenpay deposits to BTC China where they convert to bitcoins
b) and then allegedly sell on a foreign exchange (bitstamp, maybe ?)
c) following which they withdraw to an overseas bank account ?
If we're talking about illegal money (not part of the banking system) then again BTC China isn't reportedly accepting any cash. So how would that work ?
The evidence isn't really that clear. What we see is the Chinese buying a lot of bitcoins.
There's no evidence that they then moved those bitcoins to a foreign exchange, cashed them out, and then moved that cash to an overseas bank account. Do you have anything at all that supports this ? Not even the bitcoin network transaction volume is in agreement with this kind of movement of coins.