Taken from hunting guide, I'm assuming it works: The captive imp-in-a-box has unique properties. In addition to engaging in lengthy dialog, captured imps will transport two items to your bank in exchange for being released. This works from level 30 wilderness but not from level 31. In wilderness levels above 30, the imp will tell you right away that it can't transport anything for you right now. You can right-click Bank or go through the lengthy Talk dialog to get to the banking option. This pulls up a small inventory screen. You can select two items to be sent. Each item clicks out to your bank immediately - there is no confirmation, so no second chances on a "whoops" mis-click. If you only want to send one item, click it [it goes immediately and you have Imp-in-a-box(1) left], and just use the X in the top right to close the interface. When the imp is freed, you will still have the magic box trap to use again. Might be tricking banking while in combat?