This update changes the way of identifying boxes. Old boxes should work, but only while you don't change the box name in the config.

If you are doing clean install and do not have old box items in the world or inventories, you can change the name whenever you want, as was before.

• Box id is now appears in the last line of the box lore. This is required because starting from 1.16 box id can not be hidden using color codes anymore.
• A random number is now added to the lore to make box items unstackable. Th reason for the change is the same as the reason for changing box id.
• Fixed chat message broadcasting on 1.16

If you are seeing italic font in the box name or lore that was not here before:

• Update Spigot (this seems to be fixed: https://hub.spigotmc.org/jira/browse/SPIGOT-5845)
• If you are using Paper, track this issue https://github.com/PaperMC/Paper/issues/3683