[falcolas]

Well, the copy of it is just for backup purposes most times anyways, so the loss of the copy isn't going to be unrecoverable in most cases. And, as a bonus, you don't have to return home if you do forget it.

And, as I mentioned earlier, we're really quite good at keeping track of wallets and purses in the first case. Losing them is typically (at least in my own experience) a once-in-a-decade event.