BMW keys are numbered and can be reordered/cut to that number. The number is supplied on a small black plastic tag accompanying the keys on delivery.
Life being life, this usually gets lost!
The original supplying BMW dealer should also have a copy of the number in their documentation and records. If they are sympathetic and cooperative (rare for BMW dealers who are usually so far up themselves that any customer for just a part is a total inconvenience) they should be able to look it up.
The next problem is, if you bought a used bike from other than a BMW dealer, a BMW dealer will probably say they are unable to provide the number/key to anyone other than the initial customer on the grounds of security - but I think it is just their usual arrogance and unwillingness to even consider there is anything or anyone non-BMW out there beyond the white marble, stainless steel and smoked windows.
Good luck.
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