Harmony the mob and get as close to the mob as you can and open the tradebox in 3rd person view, before you hit the trade button have someone cast Invis on you. Should work as long as all you need to be is indifferent.
Otherwise if you're a race that can hide, you can hide while the tradebox is open, just be sure to con the mob and make sure it's indifferent first.
The only way this works is if the Tradebox is open BEFORE you invis/hide.
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