Pretty sure he doesn't, especiallyconsidering this game is unfinished yet and we will get a lot more weapons and armor.
Personally, I would really enjoy having the option to create like 50 or so boxes so you do not need to worry about storage.
A bandaid fix to your problem would be going to \Program Files (x86)\Steam\steamapps\common\ATLYSS\ATLYSS_Data\profileCollections and renaming one of your item banks as something else to make space for a new item box. Then, when you want to access the items from the box you renamed again, rename that storage box back to the proper file name. The item boxes are named atl_itemBank, atl_itemBank_01 and atl_itemBank_02.