Did a 25-minute run on a L23 paladin/US.
1230 copper doubloons
637 silver doubloons
186 golden doubloons
32 treasure map pieces
1 stolen emerald (from a single red-name that I encountered)
2 yellow map pieces that led to standard chests (L21 & L22 random loot-gen items)
Maybe the results would have been better if I had run through with a stronger dps char, but so far farming this area still looks vastly inferior to grogging through kobold missions.