This is a note on the menu at the Kona Brewing Company. It is there as a warning for people not to steal items from the table, but it doesn’t specifically mention what from the restaurant one might want to take as a souvenir.
The sign makes me think about some of the vendors that have almost tricked me into buying a lovely pair of lava earrings. I am pretty certain the vendors do not have permission to be selling these slices of the islands. I am superstitious enough to make sure I am not stealing from the goddess.