I recall either on this forum or bimmerfest, there was a fellow who lost a coin within the center console and did a write up on it. Try a search to find it....In a nutshell he left a coin on the closed cupholder/ashtray cover and the coin slipped through the edge. It slid back and forth on a plastic ridge.....

Good luck

edit: link: http://www.xoutpost.com/bmw-sav-foru...ace-coins.html