Thanks to both of you! sec_ware, you have a very good point - there are no fields in the header which display the location of the file, and so any collected packets wouldn't show up anything useful.

Luckily, I modified the script beforehand to make sure this wasn't possible (although I wasn't sure if there was another method through which it could be obtained). The script previously read:
PHP Code:
header("Content-Disposition: attachment; filename=".$path.";"); 
I then added the constant '$filename', and put that as the filename instead, because before any downloaded files would have the filename 'dir1-dir2-filename' (eg. 'data-Abstract.zip'), which gave away the original path

Thanks

-jk