What became of the flags Apollo astronauts left on the moon?

An astronaut in a spacesuit with a gold face shield walks on the grey dusty surface of the moon.

55 years ago today, Apollo 11's flag raising on the ancient lunar surface took all of 10 minutes during Neil Armstrong's and Buzz Aldrin's two-and-a-half hour moonwalking adventure in July 1969. 

But that seminal event in vexillological history was not without a lot of debate, discussion and early worries that were run up the policy flagpole about "who owns the moon?" (Vexillology is the study of the history, symbolism and usage of flags.)