As they look around, there's one more temptation all of them are able to view.

On a pedestal to the far right of the room, there's something that appears as the "item most wanted" for them. May it be a bottle of kewpie mayonnaise or whatever else, it's unique to all of them (everyone sees it as a different item) and something they have longed for for a long, long time.

(In reality it's a crystal monument that reflects illusions)

Otherwise, they're still free to go and there's no one else in the treasury.