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Fraudsters use this trick here. They buy Chinese imitation coins. Creates a pile of worthless coins in an old box. They arrange Chinese imitations in the box. Then they place an ad on some bazaar: "I'm selling a box of coins from my uncle. I have no idea what's in there. I'll sell to the highest bidder. Price from $1."

They don't issue the imitations for genuine coins. It's hard to prove their intent. They knew nothing...

right, that's why its a good idea to have some knowledge and tools to spot fakes when buying from private sellers