Following recent debate on the 'alteration' of previously cancelled chips, a list (courtesy of TCR, KMW publishing) has been posted on the club website. This listing shows all Nevada chips which are known to exist in a cancelled state.
There is no inference as to which chips exist altered or uncancelled, nor the method of cancellation. The list purely serves as a reference of what exists.

http://ccgtcc.marlowcasinochips.com/cancelled.html

The page can also be accessed through the 'Education' link on the club site, which Greg has just revamped.

http://www.ccgtcc.com/reference.html