Yup there are only 2 rooms, the left side does Klaxxi then Mogu, right side Mogu then Klaxxi.
Tanks shouldn't be popping boxes - someone needs to run ahead so there is always a mob up (rogues / hunters would be good choices due to TotT/MD, I did my side on flex).
1) The pandaren give buffs, so get those out first. Someone has to actually click the object they drop to get the buff - they are per-role on that said, so if I pick up the DPS item all DPS get the 3min damage buff
2) Big ones give the most power, so those next
3) Then mediums, with each medium in the Klaxxi side open a small because they're all a bit useless
4) Smalls to fill up