Rattle in the back

[sbmike]

The rattle the dealership says doesn't exist has returned. I've narrowed it down to inside the rear hatch door. Any trick to getting it off so I can look inside to see what is loose? In the old days door panels and such were held in place by clips that could be carefully pried with a screwdriver but it's been many years since I've actually been behind a door panel and I don't want to break anything if I don't have to. There are two black plugs (or at least they look like plugs) on either side of the top of the hatch. Are they removable and reusable? I seem to recall that some of those things are one way and once they're in and come out they're trash and have to be replaced. Not that they could cost that much. Thanks for any help you can provide.