Storage boxes may be fixed. I just got them working for me.
This is mostly for Pain, but if there is trouble logging in, from the main screen go Options - > player profiles -> edit your profile and change your hair type. then log back into the server.
Something to do with a new character model and hair.
For anyone else who happens to google "Storage crates not working in 7 days to die 10.4"
You need to edit the blocks.xml file in Data/Config
Change
<block id="1221" name="storageAmmo">
<property name="Class" value="secureLoot" />
to
<block id="1221" name="storageAmmo">
<property name="Class" value="Loot" />
for all of the types. storageBuilding, storageExplosives etc.