I've just spoken with the FBO manager. ATC records identified the
Pilatus; its tail-number is not my reserved number. The number I
spotted on AL G's list as the only possible miscopied number is the
one; apparently the flustered lineman tried to write the number he
remembered while glancing at a parked airplane and the two numbers
merged in his mind. Result: my number. The FBO will handle the
matter without my further involvement. A strange incident; not as bad
as I had feared, but it's prompted me to take stronger steps to
protect my personal data. That's going to be a project of mine for
some time to come.