Be more specific in your auction?
Only sell to people with good feedback?
Keep to your word?
There really is no way to secure a trade between the two, unless ANet linked the two together, and I can't see that happening unless they have control over the auctions system, which I also doubt will happen. You just have to hope that people are honest to their word and know what kind of transaction they're making.
Otherwise, just sell to other players from inside the game.
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