I recently picked up these chips. Any held on ID and value would be appreciated.

ES - plain mold - colors
Shamrock - T mold
SL - 50C reverse
1/2 of token - Grand Card Room 25C/reverse- air conditioned basement 25c - This token does not appear to be cut. It looks like this was the way it was manufactured.
RDS - reverse has Oliver's Lake Tahoe covered on a gold hot stamp to block out the name. TCR shows this in lavender without any cancellation. Anyove know the story behind this chip?

Thanks for any info.

Mike