I think it is a multi factor issue. Many times where the hurricane didn't do the predicted damage or missed them completely.
Coupled with the fact that there must be families with priceless historical items in the collections. They know there will be looting.
Unfortunately, this time - they are going to be hit.
And insurance companies are going to face bankruptcy.
I looked at New Orleans' Convention/Visitors Bureau and there seem to be a number of fine museums in No that could lose some of their collections.
For example, here is one:
http://www.confederatemuseum.com
This museum is south of the French Quarter and appears to have a very valuable and priceless collection of Civil War-related items.
I'd hope that some of the curators for these museums got many of these artifcats out of NO.