Best advice I can give you, buy the gun not the story. A place that sells parts telling a story how they found a box labeled CRANE P226 slides and then confirming they are from Crane because they talked to some SEAL and some FOIA document that is cut down and doesn’t show anything matching and then add in the claim that the slide you will get will look the same “or better” while not photographing their best looking slides.. The whole thing is dubious.
These slides will need a lot of work to make them function again and are not compatible with current slides. You can’t just move the parts over from a current production P226 to this slide. It will need parts that are no longer made and getting harder and harder to find. You’ll need a new breach block assembly, breech block pin, firing pin. You be buying a really expensive slide that has a neat story that may or may not be true and it certainly makes older slides that have parts that are no longer in production and quickly becoming obsolete, look more attractive to buyers. I wouldn’t touch these slides even if they were half that price. Good luck with it though.