Is that serial number J161503? If it is, the serials database says that's a pair of the first Juliets ever released. You might want to stick black lenses in them and sell them as that. Either way $275 is a very nice price and if I wore Juliets anymore I'd be sorely tempted by those.
Yes it's a J I'm not at home but do believe its a 6. I can't speak for sure that a box came with them , could have lost in divorce move, but I'm pretty sure bought them in 01 at sunglasses hut probably didn't get one.