The Practice Lock can only be used once. After that, it is opened and completely worthless. Many players will instead practice with renewable lockboxes off the Image:Neutral 15.gif Merchant Coast near Ratchet, Image:Horde 15.gif Amani Catacombs in Ghostlands or Image:Alliance 15.gif Alther's Mill in Redridge Mountains. On September 2, 2007, Blizzard patched-in support for the auction house telling potential buyers whether practice locks have been opened or not. Previous to this, unscrupulous players could auction their used practice locks to be bought by unsuspecting players.