In a message dated 8/25/2014 10:52:15 P.M. Eastern Daylight Time,
genevasaintamour@HOTMAIL.COM writes:

Not a  regular key. I too, have a plethora of those. I can send a photo if
you're  interested.
It has a Bosch symbol and a long, straight round shaft.

could be the "antenna key".   that's right, some late model  vanagons that
were equipped with bosch antennas had a "key" (stamped with the  Bosch logo)
that enabled you to retract the antenna down into the body and when  you
wanted to raise it you'd use this little key to unlock and raise  it...   just
a silly little German invention to keep  thugs from  snapping your antenna
off in the city i guess...