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Every item has a unique ID. The trade system works by placing that unique ID into the trade box, the server queries its contents and sends that to the person you're trading.
Which means you can only put an item in there if you know its unique ID. If you try putting someone else's item in there, it fails. You must own the item in order to stick it in the trade window.
You CAN stick items in the trade window if they are in your warehouse, or equipped, however, the server will lock up the trade, and the trade window will hang up on both sides.
So you're answer, is no, you make certain items appear in the trade window unless they are in your bag. The closest possibility to this is the 'itemtype' scam, where you modify an itemtype.dat to make weak items appear strong, then send it to people so they see a much more expensive item than you put in the trade window. Not very feasable anymore.
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