This is very possible. In the Job Properties the package is called by "\PackageName" and not a full path. I am assuming this is the default path then so I went to "C:\Program Files\Microsoft SQL Server\90\DTS\Packages" and in here there is a folder with this name and also files in the root so I am guessing the package is in 2 copies but only one location has a .dtsk file, so this is where I did my editing.

I have searched the server for additional packages with this file name and have come up blank unless there is another one by this name stored within SQL and not on the file system.