The rod for the portal is in the queen's chest (ornate rod). As you walk around the upper castle, you'll come to a room with raised design on the floor. Stand on that, and you'll get the portcullis key.
For the other items in the treasury, find the constable in the cellars. Pickpocket or kill him for the Constable's Key. That opens a safe in his office upstairs that has the remaining slips.
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