Just noticed. In the link I attached with the 66 BPP-100 in varies forms of construction, look at the last picture of the auction, the 3rd stack, 7th chip from the bottom. If you look carefully you'll see where there is a nick on the blue insert there's no blue where there should be.

https://estateauctions411.hibid.com/lot/197539420/66--100-park-place-casino-chips?ref=catalog