I have a 23 Corolla SE, that after hitting a bump, developed a dash rattle that sounds like plastic or something that sounds like it's coming from under the speaker grill/a pillar area of the dashboard. I took the glove box out and the speaker grill out and reached around in there and could not find it still after an hour of looking. I also drove around with the grill and glove box off. I still can't find it. Someone posted this video on YouTube that has pretty much the same sound, but it was posted a year ago and has no comments so I'm not sure that I will get an answer from that person. But here is the video. Has anyone experienced this?