The One Ring RPG TOR RPG - Modification to keep dice tray from slipping out and losing dice.
I put a small piece of velcro on the back end of the tray (the stiff/prickly side of the velcro):
Then put the other side of the velcro inside the box in the position the tray would be at (soft side):
Voila, now it holds in the tray, the dice, and even keep the books and maps from slipping out.
In future versions of the slip case, they might want to consider something like this, also maybe a separate "shelf" for the tray to sit on that separates it from the books, but this is a very inexpensive and easy fix that keeps it all together.
I hope it helps out others.