Paris,
you should be able to open the EPS file before approval.
If you don´t have a specific software to open and edit EPS files (Like Adobe Illustrator) you can use an online simulator that lets you view the content of that EPS file, but you won´t be able to edit it. The jpgs you received are raster files from the editable EPS file.
You can see the EPS file online here:
http://promote.3m.com/eps_viewer/index.jspNat