As per their update in group, someone seems to have posted the key and claimed 100 CPD Token as well.
Money gone 1 minute after release of Hint #7 .... very clever or very suspicious !
A 100 CPD reward for the first person to post private key seems to have been declared in their Telegram group. I have updated that in OP.
Does these 100 CPD have value or some expected value?
They don't seem to have any preset value. Token has not yet hit the market. Distribution is scheduled on January 3, 2021. How would there be a value, if it has not hit the market yet?