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They're kind of currants-y.
BrickLink lists coins as "minifig, utensil coin type" … with the mark on it following such as 10, 20, 30, 40 and part number 70501a for the 10 mark coins.
The green printed tiles are called "tile with 100 Dollar Bill Money Pattern" and number 3069bpx7.
Hope this helps!
To this day i have no idea what they used as currency, or how that lego economy survived, as the treasure effectively went nowhere, except to be fought over, like a trophy.