How can i open Ancient Guo-Lai Cache?

hi~



first of all, i sorry bad english.



How can i open Ancient Guo-Lai Cache?



when MOP, i'v used objectgatherer.

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but now it's not work. so how can i open the Ancient Guo-Lai Cache?



it's has 3-4 treasure. So it's need to time delay after open Ancient Guo-Lai Cache.



please help me.:):)

How can i open Ancient Guo-Lai Cache?