Something's fishy.....
The dude's other sales are all weird, like he's some kind of scavenger ebay/reseller. Secondly, the pictures of the tank are still in a warehouse, most likely the manufacturers warehouse.
I'm sure it's completely legit, it's just that something is weird about it.
The tank itself is weird, but if you are wanting to showcase fish and not a scape (coral, plants) then it makes sense. A good school of discus would look great in that. However, for that depth and height, I'd want at least a 6' width.