If you purchased a Storage Trunk for Eldritch Horror prior to August 2018, I can send you an updated insert, and instructions on how to modify your trunk (if necessary).
Contact me at barry@brightbearlaser.com, and also please send me several pictures of your trunk – particularly how the trunk looks when empty, without any containers in it. That’ll let me know what I need to send you.
Note that this is only for current owners; I’m not generally selling the insert separately from the outer trunk.
Instructions are here: https://brightbearlaser.com/instructions/trunk-for-eldritch-horror-assembly/