When my wife and I checked in to our room on the SWC a few weeks ago, we noticed there were four plastic straws (still in their wrappers) that were obviously old enough to have discolored still stuck in the door. They had fallen almost all the way to the bottom on their own, though.
When I noticed the door still rattling as I was trying to sleep, I took a paper cup from the sink area and jammed it into the top right corner where the biggest gap was. That shut it up for the duration of the trip.