Lockette

 Noggisoggi's highly secure containers, locked with Lockette™ technology.

Lockette is a container (chest/furnace) and door-locking plugin, with signs acting as locks.

Usage

Placing a sign on the side of a chest/furnace instantly locks them, and the sign will contain this in the first 2 lines:

[Private]
<username>

Doors can be locked by placing a sign in front of its bottom half or above the door type [Private] in the first line.

Interacting with the sign (right-click) and running /lockette <line number> <username> can be used to allow access for certain users.

/lockette 3 Noggisoggi

Adds  Noggisoggi's username to the 3rd line.

This can be used to add labels as well:

/lockette 3 [Sponge]