After next update it won't be possible to sell gold nuggets (in Redding bank) which came from TC locker and all the nuggets mined before the next update. So if you want to sell some, be quick, and don't waste time on hoarding them now... On the bright side, the price of new nuggets will be increased to 100 caps. There is thousands of nuggets, and it kind of blocks increasing their price, so old nuggets will stay the way they were before - as more or less useless yellow rocks (you can still sell them for 50 caps in normal traders) and the new ones will be exchangeable for caps in the bank.