Another set of sea turtle remains lie beached on the coastline. This set of remains has an abandoned carriage half buckled to the turtle's shell. Perhaps this creature was driven to the shoreline by unknown beings rather than beaching itself as some of the other remains suggested. Powerful Greymist murlocs have made the carcass of this creature their current home.
In the carriage, you find a box with strange markings on it; perhaps Gwennyth Bly'Leggonde in Auberdine can make sense of it.
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?
I 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.