Thanks so much for this thread - I successfully got at least 1 (hopefully 2) of my old accounts back because of it. And my inventory and $L were still there even though its been over a decade! At least... the inventory says its there. Hopefully things will rez (though its all so old its probably laughable now).
They asked me my security question, where I first logged in from, where I last logged in from, and my current account name. Luckily my security questions were both things I could answer 12+ years later.