I have heard of the kinds of carriages found on the back of that turtle.  Those I do believe are naga carriages, used both in battle and in transportation of their supplies on to land.  The markings on the box you found are of the naga; perhaps the creature you discovered was killed as it was heading further south... to Ashenvale maybe?$B$BI will be sure to send this box to Darnassus with the rest of your discoveries.  This is for you - thank you again for your assistance.