Logging overwriting with Extractpages

Dear members,
 
I'm new to this forum and to Acrobat-Development at all.
 
We're using a script to get a specific String from vectorized PDF Files. This string should be used as filename for a copy of the complete pdf.
 
The Process is like this:
1. We send some printed PDF's to our clients (600-1000 /14 days)
2. The Clients check if the given Data on their Pdf's is correct, make some corrections to it and send it back to us.
3. A co-worker of mine, uses our scanner to scan all those recieved letters and save them as pdf file with a timestamp as filename
4. We are running the script then which runs the ocr-feature, and returns the client-id from the head of the file, which will then be used as the filename for the new file (done with extractpages).
 
The Problem here is, that sometimes our scanner/co-worker gets something wrong and this results in 2 different pdf-scans with the same client-id.
 
If we run the script then, one of those files will be automatically overwritten.
I want to log all these files.
 
I'm using this script to get the client-id from the pdf files and save in a new file:

var idNumber = /08\d\d\d\d\-\d\d\d\-\d\d\d\d\d-\d\d\d/g;
function ExtractFromDocument(reMatch)
{
    try {
           var Out = new Object(); 
           for (var i = 0; i < 1; i++)
        {
            numWords = this.getPageNumWords(i);
            var PageText = "";
            for (var j = 0; j < 30;j++) {
                var word = this.getPageNthWord(i,j,false);
                PageText += word;
            }
            var strMatches = PageText.match(reMatch);
            if (strMatches == null) continue;
        }
        return strMatches;
    } catch(e)
    {
        app.alert("Processing error: "+e)
    }
}
var filename = ExtractFromDocument(idNumber);
&nbsp;<br />
// this is just in case the ocr-part fails. then the file is saved with a random_numer.pdf
if(filename == null || filename == undefined) {
    filename = Math.round(Math.random()*999999999999);
    this.extractPages({nEnd:(this.numPages-1), cPath : "../GAG-out/"+filename+".pdf"});
} else {
//this is the right case
   this.extractPages({nEnd:(this.numPages-1), cPath : "../GAG-out/"+filename+"-001.pdf"});
&nbsp;<br />
}