I hear a rattle to now and then from my I/S trunk. It's the hinges that's doing it to me. I have a little play with the hinge pins. I have used foot pads for furniture to fix that by placing them next to the screw heads.
That was what I thought so I put a wad of insulation between hinges closed lid still rattles,
It must be very loud ,I wear hearing aids ,don't wear when riding .
75% loss in both ears and I still hear it.