What is the meaning of different chest colours in any different map in the loot list?

So what the color of the boxes in the “monster” tab of the world map is describing is the relative grade of the loot possible for you to farm in this zone. This is calculated based off level and CP as far as I can tell, because even though my alt is now within a few hundred CP of my main (2950 and 2700ish) the levels differ by more than a dozen. When I look at the various zones there is a lot more purple loot boxes although the level of the loot looks pretty consistent.

White means that you’re going to get very little or nothing.

Green means an ok amount but not a lot.

Blue means a good amount of loot, expect purple drops and possible yellows, oranges are very rare but possible here.

Purple means you’re going to get a lot of loot and it will be high quality BUT these zones usually have much harder to kill monsters well above your CP.

There is also a level next to each loot box. This further designates the quality and quantity of possible loot within nearby zones. Simply meaning, a lv 5 blue loot zone will have better loot ON AVERAGE than a lv 3 blue loot zone.

Whether or not a lv 4 green has better loot than a lv 1 blue has yet to be determined by me, but I think that the better color, the better the loot with the levels designating differences in loot across nearby zones.