dmesg shows nothing happening when you put the key in upside down, so is there a full USB connector on the underside not connected to anything?
I’d like to suggest that a small (8GB?) flash chip be put there for storage.
I’d be very happy to dump my USB key from my keyring which contains my ID, a copy of my encryption software, a couple of SSH keys, my avatar image (.face), and other silly bits that it’s convenient to have. Let’s not underestimate the absolute joy of having a USB key on you at all times, even if you’re not expecting to need it!
The idea of “Only” key is to just have one, right? Why is this connector wasted?