I thought it wasn't possible to get larger stack sizes than your item stacking can handle?
I currently have 94 item stacking (got tired and decided to wait with the last level for 100 stack size) and can currently handle 95 stacks. I just got 95 BGT and after I got that level I now routinely get 96-stacks of trophies when I'm fighting heroic Goblin Swamp-mobs.
A bit annoying having to manually handle each such stack after I bring them over to my inventory.