Can you help ID this piece? Old? New?

I'm thinking of purchasing this piece of furniture, seller can't tell me too much about it except that she bought it in 2005 from an old neighbor who says he paid over $10,000 for it in 2000. It has no markings on it no manufacturer no number no name nothing. It is 8.5 feet wide by 55 in tall and 22in deep. She says it weighs 300-400 lbs. Seller is moving out of state and has this priced at $500 OBO.
Is anyone able to give me any information about this piece? I'm not sure if it's an antique or if it's a custom-made piece. TIA