Center Armrest Rattle

[Video Chef]

I have a rattle (sounds like a dime rattling around) when I lift up or put the center arm rest down (the entire thing, not the leather-clad phone cover). I have removed the phone electronics tray from below and it's not the UHF or other connectors/cables making the noise. I also removed the blank tray that goes where the eject box fits and cant find it. At this point I'm not sure what else can be disassembled further or how the heck a coin got in there in the first place (prior to my ownership).