Following a topic raised on the last LVS Zedling Council Meeting, a small P.O. box area has been placed in the end. This is directly in back of the obsidian platform, in the tunnel going to the ender ender. The boxes are in the first part of the tunnel, before the stairs.
How it works:
Rename an item, or a shulker box of items, in one of the provided anvils to your receiver's name. Then, place the item in the chest that corresponds to their name alphabetically (I.e., rename a piston Aravero, and put it in the "A" slot).
This is a way of depositing messages to a player whilst offline, without having to go to someone's base.
Enjoy this new service!