Lockpicking Skill Up Through Mail

Basically, since the Burning Crusade Exp. Ive been able to send locked boxes between people throught the mail, you can unlock them, send it to a friend. When they get it it will be locked agian, so you can send them back and forth in large quantities and get some decent skill whenever you log in.

Note: I've had them Relock if I log out and back in again.