If you are working on a Super 8 50 2T, there is an additional rubber grommet piece just below the top of the oil tank. I think this is the obstacle you've found. Take the top off the oil tank, then work the rubber grommet off carefully - don't get any dirt in the oil tank, and the storage compartment will lift out easily. I just did this recently for the first time on my new scooter to check the spark plug.