A hoax, sure, but as http://metamodern.com/2014/08/08/recovering-ancient-voices-from-clay-pots/ http://metamodern.com/2014/08/08/recovering-ancient-voices-f...

A hoax, sure, but as http://metamodern.com/2014/08/08/recovering-ancient-voices-from-clay-pots/ http://metamodern.com/2014/08/08/recovering-ancient-voices-f... points out it's plausible for there to be some interesting data to recover this way. I haven't heard of any actual attempts, unless you count the Woodbridge letter.