🚀 go-pugleaf

See if this works:

if (app.documents.length != 0){   
  var myFrames = app.activeDocument.textFrames;   
  var thePageNames = new Array();   
  for (var j = 0 ; j <= (myFrames.length - 1); j++) {   
    if(myFrames[j].overflows == true){   
      try {  
        thePageName = myFrames[j].parent.documentOffset;  
      } catch (e) {   
        continue; // must be on Pasteboard so ignore  
      }  
      thePageNames[thePageName] = 1   
    }   
  }   
  if (thePageNames.length == 0) {   
    alert("No oversets found on pages.");   
  } else{   
    var s = "";   
    for (i in thePageNames) {    
      s = s + app.documents[0].pages[Number(i) - 1].name + ", ";   
    }   
    s = s.substring(0,s.length - 2);   
    alert("Check for oversets on page(s): " + "\n" + s);   
  }  
} else {   
  alert("No documents are open.");   
}