Well I wanted to contribute, and i dont think there is anything like this. SO be my guest to flame this.
1.)Okay so get a rogue to open a lockbox in trade.
2.)Make sure you dont open them at all.
3.)Then go put the lockboxes into the guild bank.
4.)I dont know if you have to wait, cause i found this on accident.
5.)The lockboxes will be locked.
Please confirm this, because this was my first "glitch" and it might have been a 1 time thing.