Hidden Image

Thanks to sesurb for sending us this info:

There is a hidden file in Hana's record. We had already found http://www.primatechpaper.com/images/C001_illustration2.jpg
as it was displayed in her file.
However, when we remove the '2' from the filename, we find:
http://www.primatechpaper.com/images/C001_illustration.jpg

Any ideas?