You will be given a passage, and your task is to generate a Yes/No question that is answerable based on the given passage.

Let me give you an example: Powdered sugar, also called confectioners' sugar, icing sugar, and icing cake, is a finely ground sugar produced by milling granulated sugar into a powdered state. It usually contains a small amount of anti-caking agent to prevent clumping and improve flow. Although most often produced in a factory, powdered sugar can also be made by processing ordinary granulated sugar in a coffee grinder, or by crushing it by hand in a mortar and pestle.
The answer to this example can be: is confectionary sugar the same as powdered sugar?
Here is why: The question is a yes/no question, and it is answerable based on the given passage.

OK. solve this:
The ruby slippers are the magic pair of shoes worn by Dorothy Gale as played by Judy Garland in the classic 1939 MGM musical movie The Wizard of Oz. Because of their iconic stature, the ruby slippers are now considered among the most treasured and valuable items of film memorabilia. As is customary for important props, a number of pairs were made for the film, though the exact number is unknown. Five pairs are known to have survived; one pair was stolen in August 2005 and has never been recovered.
Answer:
have the stolen ruby red slippers been found?