The Museum of Contemporary Art in Tokyo has failed to appraise 1,400 works of art, or about one-third of its entire collection, according to a document submitted by local government auditors that was obtained by Kyodo News on Saturday.
The museum, which is under the control of the Tokyo Metropolitan Government, is required to assess the value of its collections because they are considered public property.
A metropolitan government official called the museum's administrative system "sloppy."
Some of the pieces that were not appraised include works by famous artists Masuo Ikeda and Shiko Munakata.
Metropolitan government officials said they will finish appraising the works by the end of next fiscal year after allotting a budget for the project.