Spamton

Adds packages/cardboard boxes, Parcels, Parcel shelves, and Letters

Packages

Small storage (9 slots) that can be picked up when taped. Has a chance of breaking if retaped (taped, untaped, and taped again). You can set the sender of the package by shift right clicking it, and the recipient of the parcel by right clicking it with a named paper in your inventory, or shift clicking it with a named paper

Stamps

Way to identify and distinguish packages (or just make them cute :D) Gives you a stamp of a player when clicked on a player or player head. Can be found in a shipwrecks map chest

Letter

Worse but cheaper version of a book and quill, has a maximum of three pages

Parcel

Stores a writable item (letter or book and quill) along with a gift item (any non-writable). You can set the sender of the parcel by shift right clicking it, and the recipient of the parcel by right clicking it with a named paper in your inventory

Parcel Shelf

Stores up to 9 parcels