A common attempt is switching an expensive unusual hat with a much cheaper unusual version of that hat; the item will look the same in the trade window but have a different effect.
Other hives are generally considered to be nothing special, and sell ar market.
The most important rule of not getting scammed on Steam is to never click a link.
He even want to give you the money before you give him the item, what can go possible go wrong? Keep in mind that the funds added to the balance are just a visual appearance.
Use this information to learn how these scams work, and protect yourself against them.
I think there's a new method.