Doc
That is a good question. I do not know. IFF they have found some kind of evidence (I really doubt) then they can do this, i.e., coming out and say we agreed before but now we have some evidence showing that WMI's $4B wire transfer is fake. But they really need to have a strong evidence for this.
I think that in US any wire transfer more than $10K requires some sort of registration or something. The bank asked me before and I reduced my wire less than $10K for this reason. It was few years ago, I cannot remember it exactly.
This could be a simple proof for WMI's wire, who knows?
Those high, very high paid lawyers love to make things complicated on JPM side, I guess.
Best
Climber