Well, yes, we can come up with a bunch of explanations. But there's no evidence any such fulfillment system ever existed, except a little bit of handwaving from Mt. Gox insinuating it might have existed.

(I know you're not defending anyone, and I really appreciate having a good debate partner. Certainly not looking for an echo chamber. Just wondering how the simplest explanation isn't the best, in the absence of evidence.)