Right, but we and apparently the OP don't know is who is the extended warranty from. Agreed, a BMW warranty should transfer with the car just like the extended maintenance does. Clearly the original owner bought a third-party warranty and it was not properly transferred so it is now void...
2011 Space Grey E90 M3, DCT, Comp. Pkg.
1997 Z3 2.8, Artic Silver, Tanin Red interior, MT
1974 2002tii, Inka, 5 sp manual