We have helped clean up at least three of these.
Several things seem to be recurring issues.
This is because the soot is so finely divided. Because the things do not look dirty or damaged, and because everything within range of the soot including walls, floors and ceilings still needs complete cleaning, it may be difficult to get insurance to pay the full cost. Like any soot, there are oily components that cross-link and get more difficult to remove with time. And like any other disaster, they will be much more difficult to deal with if the institution does not have good record-keeping and organization of collections.