It should do the job, but I won't really know until the house burns down.  Surprised to learn that certain articles need to be packed into a waterproof container in order to survive a fire undamaged, but instructions don't elaborate about how heat resistant said container should be...would a microwaveable container be OK?  I can only assume until I get around to contacting SentrySafe, but I think it would be helpful to have a few words about that in the instructions.