Only tagged objects raise counter

Hello,

I have objects that move through a trigger, and in doing so raise a counter - which in turn loads a new scene when it hits the right ammount.

However, the problem I am facing is that any object with a collidor on will raise the counter, instead of just these characters.

What I am hoping to have is only colliders with a specific tag (In this instance, box.) to effect the coutner trigger.

As far as I know, it SHOULD work with the following, but for some reason it dosn't Items with other tags or no tags still effect it.

Anywhere, here is the script:

 var score : int = 0;
 var customButton : GUIStyle;
 
 function OnTriggerEnter (other: Collider){
     if(gameObject.tag == "box") 
         score += 1;
 }

 function OnGUI () {
     GUI.Label( Rect(10, 10, 2000, 2000), "Escaped: " + (score), customButton);
 }
     
     
 function Update () {    
     if (score == 4) Application.LoadLevel("level1");
 }