A group of ancient coin collectors bought 23 ancient coins from a London dealer. They were seized by US customs because they didn’t have the “proper paperwork” to prove that the coins weren’t looted objects. Is it safe to even buy ancient coins internationally? According to the article they were 1,000-2,000 year old coins. But basically that would apply to all Roman Republic & Roman Empire coins as well as Greek coins like the famous Athenian owl Tetradrachm which is even older at 2,400 years old. How exactly do you prove that a coin you bought overseas from a dealer or collector isn’t a looted object?