I have a good story about the black plastic sliding right off the key....
Bunch of years back (had to be a bunch because I was riding my 2000 Ultra at the time) we were at Mrytle Beach for Bike Week and stopped at the convention center.
For some reason (that I can't recall) I was just carrying the key loose in my pocket, not on a ring or anything, . Anyway we get parked at the convention center (amid literaly thousands of Harley's), lock the bike up, and head in to enjoy the festivities.
Upon returning to the bike later in the day, I reach in my pocket for the key....and low and behold all I come out with is the black plastic cover. No key! Searched all my pockets...No Key!
At a loss for what to do before the panic set in, I try the tourpack... not a reasonable thing to do because I know I locked it...but it opens right up.
And surprises of surprises there inside the tourpack rested my key on top of several bags of McDonalds garbage.
Apparently when I locked the tourpack the key stayed in the lock and only ther black plastic cover went in my pocket. Some courtious Harley rider noticed the key hanging out of the side of the tourpack and saved my bike from possibly not be there at all when we came out.
I think the McDonalds garbage was his way of saying, "You're welcome dumbass"