He probably gained the CEO's trust at some point. Something like "I bet I can break into your personal bank account given public info?" CEO interest is piqued.

He probably gained the CEO's trust at some point. Something like "I bet I can break into your personal bank account given public info?" CEO interest is piqued. Gives him a business card, let's talk soon. The on the call, KM: what is your checking account number? CEO: that's private KM: it's printed on every personal check you write, so definitely not private CEO: ok, good point, ####### KM: great, now tell me the numbers on the card I gave you CEO: your phone number? KM: yes CEO: ok, ######## KM: ok I think I have what I need CEO: really? that's it? KM: yep, let me get to work, we'll talk soon