Trunk chatter

Hello all, wondering if someone has had this issue and knows how to fix it. When driving my 74 dart the trunk makes an awful chatter going over bumps. We’ve narrowed it down to possibly the inner trunk lid skin is tapping the top of the trunk lid. Is that a possibility? I’ve checked the latch to make sure it’s secure. Anything helps! Thanks:)

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There is a pad that sits on top of the gas tank that prevents the tank from rattling against the trunk floor. If the trunk lid is closing tightly, I would look to see if that pad is in place.