Lots of home-bred mules among the CIC chips, Michael. Not hard to replace one center with a different denomination. I suspect most of your 100's and the 20 are in that category. If you aren't experienced in recognizing these, have an old timer check them for you.

Remember that lots of the older CIC chips from Frontier were burned, which didn't destroy the coin centers so there was lots of material to play with 20-30 years ago.