Lobo in Classroom to Different Monster?

I'm having trouble with this too with a chest in Zozo.

Programs I'm using:

FF3LE
FF3usME
FF6MDE

I've found the chest and changed the pack # and the monsters that appear in the pack I've selected, but it still shows up as "Lobo" in FF6MDE and when I open the chest in-game.

My process:
Open up FF3LE
Go to Map 0E1 [Zozo, inside]
Go to treasure #1
Change type to "monster-in-a-box"
Change pack# to 254 (I've tried other pack numbers with the same process and got the same result); it caps at 255, zone eater.
Open up FF3usME
Go to Formations
Go to packs
Go to pack 254
Change all the monsters to the same monster group
Open up FF6MDE
Go to chest 134 (armor shop)
Monster pack reads as 254, Lobo


I've done the steps above in that order, and in other orders as well (FF6 MDE, FF3usME, FF6LE, flip them around, etc.); for some reason it always shows up as "Lobo" every time. I feel like I'm missing something, but am at a loss. I just recently picked this back up again, but have been able to do everything else I've needed to do just fine.

My intent is to put a unique enemy (already in-game, changing battle script/stats) in the chest rather than one of the pre-supplied monster-in-a-box packs.