get alert if .indd files not found

Hi Forum,

I tried to get alert if found and if not.

the alert is shown only if the .indd is found inside the folder. 

when deleted .indd files and checked, the "not found" alert is not produced.

var folder = new Folder("/Users/Wander5/Desktop/Wander5");

var files = folder.getFiles('*.indd');

for (var i=0; i<files.length; i++) {

var file = files[i]; 

  if (file.exists) {

alert("FOUND!") }

  else {

alert ('not found')

}

       //break;

}

Please can anybody tweak on this.

thanks