The mummies are easier to find than the quest giver tells you. They are in Northwestern Ro (NW). You can kill any mummy you find there and recieve the embalming fluid, not just the ancient ones. If you have any trouble finding these mummies the other option is to go to haznak, which you will want the coach for later hunting anyways, and there are an abundant amount of mummies around it also. Hope this helps.
P.S. if you dont have a zone map to show you where these areas are, you may want to print one off from this site at,
http://eqoa.allakhazam.com/Printable_Zone_Map.html
GL/HF