This is a real bug bear of mine. A bloody key. On it's own. Without a fob. Is not a main key. How dare it masquerade as one? It pisses me off because being the tight arsed scared buyer that I am it means on top of looking under the bonnet, shaking the steering, making sure the electric windows work, checking the bodywork for knocks, asking the driver to rev it, seeing how the clutch is and making sure the underneath isn't pissing out black stuff I have to make sure I haven't got the one key left after the cocker spaniel has had the others and most of the remaining for breakfast... and they call US crooks.
In my case: You vent and breath.