This was the green Xiaguan(left) tuocha I could buy locally till early
2005. Now no green tuocha since. Luckily I stocked up for < buck
each. Before I got dangerous in Chinese I sent one to Sasha and he
said the production date on the bottom of the box(center) was Jan 2000.
My box shows the yi character for the month. This box shows the jiu
character but the year is the ling character. Everybody scoffed and
said probably a forgery because Xiaguan didn't print production
information on their boxes. I came across this picture on a Japanese
website with the certification(right) from 1999:

http://i14.tinypic.com/34eqb86.jpg

Jim