Since you have a sedan and you have caused a change in symptoms by playing with the fuel door, I would remove the trunk lining on the right side and remove the wires from the fuel door switch.
If, as I would suspect, the switch has to be closed to cause an alarm, removing the wires will stop your false alarm. BTW, don't forget to close the trunk when you perform this test, or you will get an alarm from the trunk.
After the wires are removed, you could test the switch with a meter.
If your car is like my 850s, start taking the trunk apart by removing the center trim piece at the rear of the trunk and work around to the right side. Look for things that overlap - remove them first.
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