I took apart my door panel and plastic and I can't seem to find the rattling as it seems to be INSIDE where the window goes down..

So what should I do at this point? It's very hard to reach in the small holes and I can't figure out for the life of me where it's rattling inside. It rattles like crazy, like there's something loose inside, but there is no space to find it and I don't think its possible to inspect the inside freely.