- Milling and then relabeling.
- Filling of cancellation holes.
- Flattening of warped chips.
- "Reconditioning" of rolling edges
- Overlabeling of chips.

The hobby is changing. Pandora's box is open and these things are out there. They aren't going away. There are very creative people figuring out ways to make their chips "better".

IMO the best thing to do is embrace the fact that this is happening, because like it or not, it's not going to stop. IMO the best thing we can do as a single chip collectable community is to extensively document how the alterations are happening so they can be identified. We all know that even with the best of intentions, some of these chips will get out and be misrepresented as "authentic". We also know that asshats out there will do these things with the intent of deceiving the chip community. Knowledge is power.

As collectors we are gonna have to be on top of our game when buying chips. Times are changing and we have to adapt or die out.