how do you tell?

[Orphen]

The majority of dupers and hackers are American, sad to say. There may be..a few legitimates, not much credit to you on that, Ivan, but still, this guy has a point, I hardly see any UK or JP users using hacks, not counting the hackers who run around under the Japanese language setting.

Well, insane deals, as well as high % are a way to tell. With weapons that can be made, though, you should ask how they got or made the items, as well as what components they used to make the item.