Conversation so far:
What are the whereabouts of Hattie's oscar?
The whereabouts of McDaniel's Oscar are currently unknown.
Was it stolen?
In November 2011, W.
B.
Carter, of the George Washington University Law School, published the results of her year-and-a-half-long investigation into the Oscar's fate.
What was the Oscar for?
CANNOTANSWER.
What did the article say about the investigation?
the Oscar was likely returned to Howard University's Channing Pollack Theater Collection between the spring of 1971 and the summer of 1973.
Are there any other interesting aspects about this article?
inadequate storage or record-keeping in a time of financial constraints and national turbulence may be blamed.

Question: When was it noticed missing?
Self-contained rewrite: When was Hattie McDaniel's Oscar noticed to be missing?