I'd bet that there's still stuff to be learned, especially in metallurgy. Some types of cracking, especially within the bulk of metal, should be well-preserved

I'd bet that there's still stuff to be learned, especially in metallurgy. Some types of cracking, especially within the bulk of metal, should be well-preserved. Wear patterns should still be visible, even after corrosion. Some chemical changes only take place at high temperature. Furthermore, if any old NASA designs were lost (or if details are classified), salvaging the hardware guarantees you access to flight hardware.