I think the mithril plate +2 is in a pile in front of the drow who are way over on the top right of the map. This is the same map that has the huge fight when you enter, with archers and mages on both sides of a bridge you cross.
I suppose if you didn't fully explore the map, you could miss this pile and the three drow guarding it. You can also get a good crossbow or two and some Bolts of Biting off the drow there.
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