One will have paid for two keys, the second made available as pressure on supplies lifts. If one were to loose the only key I'm pretty sure they would expedite a replacement (surely they could recode any existing fobs they have?) and cut a physical blade foc.
Normally if one looses a key one's insurer would pay for a replacement (depending on cover, mine does) as it's one's own 'fault', not a problem for the dealer to sort. So, in this scenario one would still only have one key after the second (replacement) is supplied.