They used a duel adapter to copy the card to the desktop of a macbook pro, and then copied that to a field drive. They did not attempt to play it back in the camera, so they didn’t notice any errors. Part of the clips play down in FCPs log and transfer, but it seems to get to a specific corrupt point in the video and either causes FCP to crash, or the unfinished clip appears with an error exclamation point in the cue window.