According to Robert Eisenstadt, the manufacturing of chips using the web mold (MD-91) was turned over to Paulson around 1995. Eisenstadt provides a brief history of the mold on his site (link). At some point, Michael Patton owned 14 sets (28 cups) and offered them for sale, but I don't know who picked them up.
Check out this thread on ChipTalk. (warning: yellow text)
Thanks for the heads up, I couldn't resist Total count is 1009 and they are in very good shape... is possible they never saw use. I assumed I would just trash the case but it is very sturdy. Cosmetically has seen better days but it's a very solid traveling case.