This probably won't be helpful but when I'm in my Denali alone and greet that annoying rattle, I find that it is a twisted seatbelt buckle rattling against the B or C pillar.
I just got a new 2017 last week and there was a $700 cash card from Costco if you are an executive member, not sure if it applies to 2016's. Also not sure when that deal ends. If it does and is stil on, it would be worth getting a Costco executive membership.
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