The Chip Rack is sorted by denomination, mold, description.

The chips have no denomination. Obviously the mold is 'plain'
Look in Chip Rack and that limits it to 5 possibilities.
The look at the number of chips issued. Only 3 of the listings are Ltd 2000.
One is hot pink (2002), one is blue (2004) & one is yellow (2006)
So it is 2004.