mkiiipics After wiping out the envelope and letting it dry out. Fine mud still remains in corners, but can be cleaned out. Documents ruined. Fine, gritty feel. River flood mud? Small corrosion spots on outside. More significant corrosion inside mag & around spring. Gritty movement. Outside of envelope. I believe that this sat in a flooded truck or flooded floor for a long time for so much mud & water to make it into the envelope.