As far as I know, there are 3 known chips: two 100s and one 5.

Two of the three known chips are those shown in Gene’s article

The two chips in the above scan are from the USPC sample book. Some 7 to 10 years ago, that particular book showed up. I bought half the book. I got the blue 5 (note the holes in my chip). A couple of years ago I found an undrilled $100. I believe the 3 chips are the known population.

Do you know if others have been found?