I have 2 of the blue/grey 25 cent chips. I will look for other denominations and get back to you.
There was an eBay seller...nanc_nurse (I think that is right??) from Ozard, Mo that sells them from time to time. They are /were club member and sells them as Concord. I believe they are the original find of the chips and they might of found them in Concord.....not sure what is true or mis-remembered 😀