Managed one 40% half coin dumping in Vegas
 

Only dumped 80 bucks worth of halfs from one of the few (rare) casinos that still spit out coins on some machines. Got a 1966 and even won $2.50 before I quit ahead of the game so to speak. The 1943 Australian penny still rates at the weirdest coin dump find (from a half dollar machine). Did not look to see if any proof coins dumped out as I did not notice any that looked in any decent shape. A beat up proof is just that so why bother looking?