IMHO they had the RIGHT TO KEEP whatever was given them but if shown not to be an asset of WMB, they had to pay book value for all they kept.
The wording BOOK VALUE concerned me way back and I told all that could hurt bad. KMARTS building had been depreciated down to ZERO on the books, but their actual value was 16 plus bill $$$$$$$$$$$$$$$$$$$$$$$. SO I imagine the headquarters probably had been depreciated to a pittance of what is was worth so JPM took it
It is not difficult at all to convince ChatGPT that it is wrong. The fact that it can be done is testament that something strange is going on behind the scenes.
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