2025 Denali

I have a 2025 GMC Sierra Denali. I have 1000 miles on it. Since I picked it up from the dealer I have a rattle in the vents. It migrates from left to right but for the most part you hear it in the middle. It does not rattle if you are not accelerating. Does not rattle at Idel. Its driving me nuts. Brand new truck with a rattle. No I have not taken it to the dealer. I have read on this forum that others have the same issue, however on older models. i had a 2006 SLT best truck i ever owned. Stolen off my driveway in Jan of 24. Any Ideas?