Sorry, the people supplying the plastic were local to Chattanooga. I visited the place twice and saw the parts being made from raw beads to finished pieces. They are the same inserts. Additionally, IMO, there is less than a .0000% chance that any PCI label or slab was counterfeited. A'' parts made in USA plus and more importantly, WHY COUNTERFEIT A PCI SLAB.
Yes. I have cracked more PCI slabs than you, including those done after the company was sold, and it is STILL my opinion that while located in TN, the same company produced the hard white plastic inserts; and they are of the same composition. Furthermore, I believe the third owners (outside TN) used the same inserts. The only way to prove the formula changed is to analyze the part. If you are interested, I can send you some that you can pay to have examined. However, unless you crack the things out yourself, there is no way you will be able to tell when the ones I send you were made. Anyway, you win.
I'll have some high quality images of the coins in the near future. After that I'll send the coins in to be conserved. I'm not sure they can be helped.