Some objects of great cultural significance remain missing, though how much has yet to be determined. This is a major issue for the art market, since legitimate organizations do not want to deal in objects with unclear ownership titles. Since the mid-1990s, after several books, magazines, and newspapers began exposing the subject to the general public, many dealers, auction houses, and museums have grown more careful about checking the provenance of objects that are available for purchase in case they are looted. Some museums in the US and elsewhere have agreed to check the provenance of works in their collections.
