I believe the rules token is actualy the card with the blue boarder that was with the postcard sized 'A note for Knight Works' card. This was packaged outside the game box like the metal 4-sided die.
Edit: It has the Mogul Variant rules on one side and the Bigwig Variant rules on the other.
David is correct. The rules card for the Mogul Mini-Expansion was placed in the Collectors Card sleeve which was packed outside of the game box. We initially intended on producing a small token to be included in the game but we opted to rewrite the rules using a bit more space on a full size card. Here is the front/back of that card for reference.