Since there is a 999 cake[1], I always thought it had to do with the
grading, but [2] says that the 888 is used for being 'lucky'. Comparing
with [3], it seems that there are different cakes (but from the same
region) with the same number.

Anybody knows the truth behind these 888, 999 and perhaps 666 cakes?

--k

[1]
http://cgi.ebay.com/Old-Aged-999-Pu-...QQcmdZViewItem
[2] http://www.tuochatea.com/tea_cake/888_pu-erh.htm
[3]
http://cgi.ebay.com/Dragon-888-Ripe-...QQcmdZViewItem