There has been a lot of activities going on in their wallet but it doesn't have to come from their wallet here. They can exchange the steem or sbd to bitcoin or some other crypto and then use another market to convert them to steem or sbd and bring them here. Blockchains put everything in the open but they can't stop people from doing such things! If I'm wrong, then I'd like to hear a proper explanation from them. So far we've heard nothing but silence... Not to mention that people like me are STILL waiting for their deposits to be credited on the exchange!