lootbox

create new movie clip symbol called box that animates a box opening:

insert box movie clip to stage layer 1 frame 1, give it instance name lootbox:

add actions to layer 1 frame 1:

//Stop lootbox instance on first frame:
lootbox.stop()

//Register event handlers on creation:
lootbox.addEventListener(MouseEvent.CLICK, clicked);
lootbox.addEventListener(Event.ENTER_FRAME, step);

//Open when clicked:
function clicked(event:MouseEvent):void
{
  //Start playing:
  lootbox.play();
}

//Listen each frame:
function step(event:Event):void
{
  //Calculate when lootbox finishes opening:
  if (lootbox.currentFrame == lootbox.totalFrames){
    lootbox.removeEventListener(Event.ENTER_FRAME, step);
	removeChild(lootbox);
	trace("Complete.");
  }
}