Heckgate flaps…

I’m back with a question… Did I find it clapping in my tailgate the day before yesterday? So when I opened it, she “shaked” so that I could track the noise… Is there no screw loose? 😉 No seriously? What could that be? Take it apart is unfortunately not possible. And my father kills me if I want to get into the workshop again (see thread wheel bearings) that’s all just been done… ;-D