It's a Firebird 400 Ram Air car. The owner doesn't know what the Trans Am option consisted of, so he's assuming that since this car is white with a blue interior, and has the Ram Air engine, it's "a Firebird built with Trans Am options".
His claim that it's a 1 of 1 is wrong, unless of course he's referring to the fact that it's the only one with this VIN#, which in that case, everyone that owns a motor vehicle has a 1 of 1.
Rare car, but way overpriced. His appraisal value means nothing. You can have anyone write up an appraisal, for any amount of money, if you flip them $50.