changed at my Honda dealer I asked them to hunt for it. The mechanic said he suspected it was it the rear end/body of the car, typical of cars that had been in an accident. Mine was rear-ended 4 years ago. He said something there “needs tweaking” but couldn’t find it. Their collision center did the repair but while they claim it’s not likely related to the accident, they’d have to keep it 2-3 days to pinpoint the rattle. I’m still looking for it under the car when time allows.
I has significantly subsided but not disappeared, which could be either good or bad.