They’re tough. They’re Boeing. They don’t even look bent.
Well the one in front looks like it has a big crease in it, like it was bended.
It doesn't matter if they look bent or not. A fuselage in an airplane is a pretty important structural element. It's designed to tolerate normal use; but what stresses were applied to it when the parts fell into the river? How reliable will it be if used? If a car gets into water, it's an instant write-off, as repairs would cost more than the value of the vehicle. If these fuselages are shipped with cables and other connections, then there is no way to ensure that none of them are damaged. I saw wires that look great but the copper conductor inside is broken.
The customer will not want to buy an airplane with a refurbished fuselage. They paid full price for a new one. The FAA will not allow use of those salvaged parts. Those are the insurance company's problem now. With large volume of these airplanes assembled monthly, the impact on production schedule shouldn't be significant. It's not like spares for the Shuttle; those are indeed not made anymore.