The screen isn't displaying any UI as far as you can tell, so you just start pressing buttons to see if you can access some kind of silver exchange setting, if that even exists. The ATM looks at you with annoyance and asks if it can help you. You apologize awkwardly and say you were hoping you could exchange some silver goods for some cash. The ATM rolls its eyes and says obviously yes, exchanging rare metals for currency is a default function for all Autonomous Transactional Moneytrons, are you an idiot? You say you don't think so, although you definitely thought ATM meant something different so now you're not sure. It rolls its eyes again.