It's road construction season where I live. If there's a lose part anywhere in the interior, now is the time of year I'm going to hear it! I've been chasing a toy-like rattling sound coming from the windshield area. I thought it was the defroster vents at first, but it wasn't. One rattle was coming from the radio bezel. I pulled that apart, snapped it together, and the rattle disappeared.
Another rattle persisted. I took apart the rear view mirror plastic assembly, snapped it back together, and nothing changed. I next realized the rattle was coming from the ceiling console. It would rattle even if I didn't have my sunglasses in the holder. I thought I broke it when I pulled the plastic cover away from the headliner... it took a lot of muscle to fight the clips. Everything was OK up there, except the pictured T20 torx screw. That loose screw was wiggling around nearby plastic causing the rattle. I never would have thought one screw could cause that much noise! I tightened that, and snapped the console back into place.
If you find yourself chasing a rattle, try using a sine-wave signal generator app. Route the audio into your radio, and scan up and down the low frequencies with the volume up high. Once I found the "sweet spot", the rattle I was trying to find would vibrate like crazy, and I could easily identify it's location. I found that method much easier to manage rather than trying to figure it out while driving.
I'm looking forward to a reasonably rattle-free ride into work tomorrow