Mechanical lock is probably a good idea for the EMP blast issue. Does Cannon say up front that the lock is not covered, if they don't say that then the warranty is misleading. Maybe the hinges are made in China by Hong Kong Fooey Hinge Company and they are not covered either, I think Cannon is wrong here or at least they have made a very poor business decision.
Im in a holding pattern too then. Maybe its time to get a nice one from Johnson safes and know its warranty is good.