invented to keep out the cold
Did Morgethai run off with it? Archmages can just... do that, can't they. Was she just being polite all this time? If she's known to have stolen the treasury, she probably causes herself some problems. Can an archmage find... whatever you call a fence when it's for the treasury of Korvosa? Probably. Will they actually keep her secrets, though. Is an archmage's wealth really constrained only by how easily she can transmute money into less obvious money. What a ridiculous position to be in.
(Could it have been someone else? If one of Togomor and Ileosa escaped and is in hiding, they could have run off with it. Same constraint. It could have just been looted by the guards when they had nobody to report to. That would be... exceptionally human of them. Not impossible. There are options besides Morgethai.)
Anyway. Anyone who loaned money to the Arabastis is in trouble. They must have had some assets with the Bank, but she has no idea how those will be paid out, if at all. Not her field of expertise. Who would that likely be? She can't do anything herself, but it's always worth knowing who is in a vulnerable position and might accept a gift without contemplating it in depth. Worth hunting down if she has the time.
Does she have the time? Any mail for her today?