I'm not American, but the American speakers I've heard have said /bɪn/. I'm not sure what you mean by '/bén/'. [bén] does have a meaning as an IPA transcription, but I've never met it as a representation of 'been'. /bi:n/ is used to show contrastive stress (in Am E and Br E): 'I've been to France, but I've never lived there.'
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