On the manipulation by the bank itself:
It is hard to identify who exactly lost out as a result of these fictions. Since there was no interbank funding to speak of at the height of the crisis, it may not in any case have mattered very much.
Well, sorta. While there was indeed very little interbank lending, this being one of the actual problems at the time, there was still the huge towering edifice of mortgages, swaps, futures and so on priced off this now illiquid measure.