Few would agree with you that millions in cash in a suitcase is not suspicious at all. Why come from China with USD and immediately go to the bank of China in Australia to convert it, especially when the Bank of China has been accused of fascilitating illegal cash outflows from China? Why not simply do an electronic transfer and avoid all suspicion and risk?
Doesn't matter what most people think - it's not illegal for a person to bring in suitcases of cash if declared upon entry - especially if he's one of the richest men on the planet. i) That's none of our business - unless you have evidence of his illegal activities. ii) Maybe that is why he is the multi-millionaire and many are not. Ever heard of currency arbitrage? Or same day settlement? There could be a multitude of legitimate reasons.