The gold Ryo is a $700-1,000 coin and nobody in their right mind would sell a genuine one on Craigslist, particularly because of the risk of getting robbed! It is most likely a modern replica.
That said, I don't see any red flags about the rest... even the silver Yen looks legit. The silver BU appear to be genuine, and I don't see red flags with the other gold, although it helps to weigh them.
The banknotes and lower denominations all look fine.
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