Well, Roberts auction and website certainly contain a wealth of information. The auction shows the Taylor Company order card and Robert's website references 2 other denominations. I guess it is always possible that there is a forth or more color out there, but I suspect that Robert would have pointed that ditection.
However, if a T mold (the real "T" mold) was all they used, then I'd suggest looking into the T mold records. They are on-line at:
Preserving Gaming History
It is a .pdf fille (acrobat) but look to see if Frolics ordered other colors.
GL and let us know if you learn anything more.
Jim (Gaming Ore) Follis