Boot area rattles noise

Hi , when my car is twisting little bit when going on to curb or turning into a road sometimes there is a rattle noise coming from the boot area. I check everything couldn't find any problem. Also sometime it sound like something moving inside the side panels. Has anyone had a similar problem . Pls advice what to do

Rear seatback top latches rattling is a common problem. 'Fix' is to wrap some insulating tape around the latch pins apparently.