Wow CCC I am so sorry you are in this situation! My CCC coin I retrieved from a cache is my prize possession. I have figured a way to take it to events and still make sure it doesn't disappear. I can't imagine anyone selling it, and yes you made it quite clear from the beginning these where not to be sold.
As for your question Mark, I feel it is never ok to sell a coin that has been activated by someone else. If you activated it and are willing to adopt that is completely different.