I just tested this now on patch 2.4.1 and it still works
What you need:
For the first part you just need Awwe's XYZ Hack
For the second part you need Awwe's and a friend with it
First Part:
To get the first chest simply go into the instance, use XYZ to get up on to the broken bit of ledge to the right of the entrance and pull the mobs guarding the chest, run away and jump down so you are standing in front of the Instance entrance
Wait till you see the mobs you just pulled running across the bridge towards you, if you are a hunter, feign death, if you are a rogue then use that skill that requires flash powder to get you out of combat, if your class has no way of leaving combat then leave the instance, then quickly rush back in, hack up to where you just came from, grab the chest and run
Second Part:
Get your friend and enter the instance, Use XYZ to hack underground, then mount up and run over to just underneath where the first chest is (near the first boss) Use XYZ to pop up near it (or fly up on a flying mount, I don't have one so I don't know if you can)
Now to make sure you aren't in combat disband the group with your friend and have them run in and take the aggro whilst you grab the chest, you only have 60 seconds to do this once you disband.
Take it in turns with your buddy to take the aggro and grab the chest
Please note: Each time you enter the instance one chest will be locked and the other unlocked, so either bring some Arcanite skeleton keys, some elemental blasting powder or a rogue who has high level lockpicking (above 300 I believe)
WARNING
DO THIS TOO MUCH AND FROM WHAT I HEAR YOU MAY BE CAUGHT AND BANNED, I have done it quite a few times and haven't been banned so no need to worry too much
GL people hope you find it useful :wave: