So, I was about to leave abyssea misareaux found a mimic and was gonna mijin gakure on it, well it turned out to not be a mimic but to be a legit chest blue with a feeble soothing light.
My theory is that the abyssites that are "The bearer will experience greater fortune with (insert color here) pyxides" are in regard to those laying about abysssea.
The only abyssite I have for that is the one you buy for cruor that is blue.
Seeing as how there is one for each color chest blue, red, gold from heroes, and visions making a total of 2 for each color.
Possibly in the next update they have a 3rd for each color making those mimics into T3 chests of that type when you open them, or making it a small chance that it is a mimic.