After farming 10 sky shards, I end with about 200-400 guo-lai cache keys for each sky crystal made. It would probably be easy to write a profile to just open these caches, with the occasional spawning mogu around the caches, but I'm not very competent at writing profiles. The caches are straight down the main hallway and down the stairs of Guo-Lai Halls, behind the cloud serpent Milau from the Golden Lotus dailies. There are 11 caches that constantly respawn every 40 seconds or so.