Also, in the trunk, where the ribbon wire goes,close to the back of the rear seat, there is another connector that transitions from the ribbon wire to a connector, which then goes to the courtesy lights in the rear. It could be that it is unplugged. The wire will be orange.
It is possible that there is a short in the rear set of courtesy lights.If the orange wire is shorted, it will blow the fuse if the plug in question is reconnected, if the white wire(ground side) is shorted the lights will allways stay on.
If the fuse box end is OK, go to the trunk area. If the connector back there is unplugged, it may be for one of the 2 reasons above
Fact is stranger than Fiction