ActionScript 3.0 :: Object Oriented Game - Referencing Dynamic Objects

I'm doing this object oriented game and I create a bunch of 'boxes' via a for loop

Code:
Select allfor (var z=0; z < numOfBoxes; z++){
var box:Object = new Object();
box.mc = new Box();
box.mc.name = "box"+z
box.mc.x = Math.round((Math.random()*(530-box.mc.width)) + 20);
for (var i=0; i<boxXArray.length; i++){
[Code] .....

I get my random amount of boxes scattered over my stage (I haven't put in any checks to see if they are touching). How do I 'name' these boxes so I can reference them later? Say I want to move the .x of boxA in another function? Is there a simple way to call them box+z instead of just all as box? (Then I can run them through a loop later to talk to them).