Illustrator Scripting :: How To Access Text Boxes In Existing Document And Replace With New Value

Is there a way to access text boxes in an existing document and replace them with a new value taken from an excel table? I've been able to create new documents from scratch and populate them with excel data, but formating these new documents to look like those we already made is proving more difficult than I thought using just Javascript.
 
Ideally I'd be able specific an index for each text box and replace them in order as i itterate through the excel(or CSV) document.
 
I already have a way to pull from the table, another question asked here, but can't figure out the object model to put the new info in a specific place.
 
Below is what I came up with to create a very rough looking document from scratch:
 
#target Illustrator
var csvFile = new File('C:/users/whatever/spreadsheet.csv');
if(!csvFile.exists){
          alert('notafile');
          app.quit(); }
 
[Code].....