One guy is selling 7 for 10k and I said sure. We opened trade and all of them were unided and I bought them.
Then he says, 2 more for 2k. I say sure, open trade window and trade it. I check they are gold and accept.
Then he says, 1 more for 3k. I tell him I got no more money, but he keeps asking me for a trade.
Meanwhile I start iding my items, only to realize that the last two items were already id'd. I open the next time he asks me for a trade, and the 3k (now down to 2k) bow was id'd too. Since the same guy had sold me 7 unid'd items for good before, I never suspected this.
But just be aware - for people who buy unid'd gold.
Its my fault too for not properly seeing that they were unid'd.

Good thing it was just 2k.