Just a heads up, the CN codes are indeed worth 10 TBT per coin, but that's if you give them the codes, not the redeemed coins , IMO CN coins are still worthy , but not as much as the coins codes themselves , so the TBT rate for redeemed coins is somewhere around 5-8 TBT , so the lowest you might want to sell those 600 coins for would be 3000tbt and the highest 4800tbt
That's just my opinion , but I'm pretty sue it won't go higher than that