Thought I would post solutions for 2 camry hybrid rattles.
First was clicking in center vent of dash HVAC. AC had to be on for a while before clicking started. Initially dealer found no problem but after polite encouragement they changed the center dashboard vent and that solved it. It must have been slightly out of tolerances and started clicking after it was cooled by the HVAC system.
Shortly after an annoying rattle thru-out the car. First I thought it was the dashboard from previous repair. Then I thought it was the roof liner. Turned out to be a velcro carpet seam in the trunk. Fold down the rear seats and you will find a velcro seam in the trunk right behind them. Wiggle it a bit and you can duplicate the rattle. For a repair that will last a while, stretch the 2 pieces of carpet and squeeze the velcro seam tight.