I once lost some lighting equipment that I had packed in the trunk of my car for an early morning shoot. It rained so hard that night, we had a rare flash flood that picked up my small car and moved it to the other side of the street. Needless to say, the trunk filled with water and the lights were history. I had insurance, but they refused to pay since they said flood damage was not covered.
Today, if you have film cameras it can be difficult to replace even if they are insured. Some carriers might consider them antiques and require a separate rider and assessment. And you will probably pay through the nose.