I hadn’t given [the scammer] the last four digits of my card.

Wait a sec.

He hadn’t asked for the last four digits. He’d asked for the last seven digits. At the time, I’d found that very frustrating, but now – “The first nine digits are the same for every card you issue, right?” I asked the VP.

I’d given him my entire card number.

Huh. I hadn’t realized the institution prefix was so long.