The problem: If a player has lots of items up on consignment, and some are sold while the player is offline, it can be fairly tedious to try and figure out which items were sold. All the player knows is that he/she now has more coins.
Possible solution: Save the message that tells the player what is sold and display that the next time the player logs in. Similar to the way that the expired orders message is implemented, as well as the Death Point fade counter.
Hopefully this is a simple thing and can be implemented easily.
-Kalexir