The talk after that turned to all the various items that the Humans might like, both from what they were allowed to purchase from the Alliance and what they might be able to get their hands on from the Black Market without it being traced back to the Station by the Envoys on their ship.
The presence of government workers made transactions on the wrong side of the law more than a little problematic, especially when the Envoys almost certainly knew where Commander Keres was and what he was supposed to be up to when he wasn't talking with the Station Boss.
That didn't mean that they couldn't do it quietly later, once he was on his way and the deals were organized, but to do them right now would just bring way too much trouble their way, and most of these people were pretending to be upright and moral legitimate businesspeople.