Have the cursed chests for the "old mill road" and the "cursed bellows" disappeared?

I have been trying to get the "old mill road" cursed chest and the cursed bellows. I have rerun both of those areas at least 100 times (literally) In the last month (5/2015) without seeing the chests. Has something changed in a recent update that would prevent those cursed events from loading? Can you only get them in another mode? Or do I just have the worst luck in the world? I have only been running in campaign.
Best Answer
Try in adventure mode when you have a bounty for that area, that's how I got it. The problem seems to be that certain cursed chests are only adventure mode based, and have an increase spawn chance when there's a bounty available for that region.
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Diablo 3 Cursed Chests: Act 1
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