The article is confusing. It says everything was destroyed, but the originals are in Vienna.
It talks about photos and memorabilia, which make sense, cause not all of it is going to be digitized and archived online, but then it says the scores are used by many people and are gone.
How are things used by many people around the world, and the originals are in another country, but are also destroyed.
I have no idea what is actually lost.