Simple IF statement help please

I have a variable (score) initially set to 0, which increments depending on some onrelease events which counts up fine, when it reaches 4 i want to display a movieclip (defaulted to visible = false).


on (release) {
 
 if (score == 4) {
  packedbox._visible = true
 } 
 
 else if (score != 4){
          packedbox._visible = false
    }
}

The score variable reaches 4 and beyond but the movieclip packedbox still does not display true when it reaches 4. please help?