How much do those items cost on average? We have similar sellers here, usually sitting outside the Vietnamese/Chinese markets, selling their wares for about US$10-20 apiece, sometimes more. While interesting, I seriously doubt they are the antiques the people say they are.
I'm not familiar with current prices or an expert in this area. Based on my experience, I'd bargain with the assumption these are reproductions. But even those come in varying qualities so . . .