Auguries of the Jade Turtle

Doesn't that sound like it should be the title of a Sherlock Holmes story? The Shanghai Daily is reporting the discovery of the oldest divination tool ever found, a 4500-year-old jade turtle:

A 4,500-YEAR-OLD jade tortoise and an oblong jade article discovered in east China's Anhui Province are China's earliest fortune-telling instruments found so far, a senior archeologist said yesterday. The two jade objects were discovered in an ancient tomb in Lingjiatan Village, Hanshan County.

The article goes on to describe (in too-scant detail, and without pictures...) how archeologists guess the objects were used.