Eh, I beg to differ:
Code:
[00:15:16]yThe monster was concealing a treasure chest!
[00:15:16]Juliano defeats the Plateau Glider.
[00:15:16]The Plateau Glider misses Juliano.
[00:15:20]The Plateau Glider hits Juliano for 103 points of damage.
[00:15:21]Juliano uses a forbidden key and opens the lock!
[00:15:23]Juliano gains 250 limit points.
This happened near the end of my run last night, about 3.5 hours, after a shitton of time extensions, and lots and lots of 1250 exp chests. Seeing as I'm the Monk, yes, I had capped azure/pearl pretty much.
Maybe it's just really rare? That's the first time I've personally seen it, that I can recall.