The sleeve works with the emergency key (which is mentioned above as being discontinued).
The emergency key is (was?) a slim plastic key with an encoded chip embedded in it. It is sufficient to unlock the doors. You then fit it into the sleeve, which is the correct shape to fit into the slot on the fascia. The embedded chip in the key is enough to start the car, once locked into the fascia slot.
It does not unset the alarm until inserted into the fascia slot, so using the emergency key to open the car can be a little noisy. (I say "a little", as the alarm is not very loud).
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