Installation

In Blender open Edit, Preferences, Get Extensions, then use Install from Disk and pick the street_bin_mailbox_generator zip.

Usage

1. Open the Bins & Mail tab in the 3D viewport sidebar (N). With nothing selected, click the picture to pick one of the 40 designs, or browse by family, then press Add. You can also use Shift+A, Mesh, Bins & Mailboxes.
2. The card at the top shows the design, its size, capacity and face count. Surprise makes a new random object, Vary changes the current one a little, Colors picks a new paint scheme, Wear adds new dirt, rust, stickers and garbage, and the arrow resets the design. The two quick sliders open the lid and fill the bin.
3. The icon tabs hold every setting: Body (shape, size, walls, material, units side by side), Top & Lid, Mount (wheels, posts, walls, piers, underground), Front (slots, apertures, doors, lockers, plate), Paint & Decals (colors, text, pictograms, stripes, stream colors), Wear & Garbage, Site (ground and enclosure) and Parts & Export (part visibility, detail, Convert to Mesh, Make LODs).
4. Every object stands with its origin on the ground in real meters. Each part is its own named object in the object's collection, and lids are separate hinged parts, so you can animate them.