A simple, classic mailbox with a rather glossy gray/black material (color can be easily customized in Blender), a door that can be rotated to open, some kind of glossy gray metal pieces that keep the door shut, a red flag on the side, and a wooden stand (with everything parented so that if you move the vertical stand, everything else moves).
There is a high poly and low poly version of this model in the download (one of each for each file extension). The high poly model has an issue or two, mainly in that on the side there is something almost like a crease (see final preview image) from smoothing the flat side with the rest of the model.
P.S. I use Blender and Cycles Render to do all my animating, 3d modeling, and compositing. Because of that, some of the extensions don’t export very well (or just don’t import well back into Blender; they might import better into other programs); there are generally a few issues with the formats other than .blend. If you have Blender at all, I recommend just using the .blend file; it’s all set up and everything. – 3DS: Imports with flat shading and without (complete; all the material nodes vanished) materials or textures. It does keep UV maps though. Also, parenting is lost, and the origin of the door is put at the base of the stand (so it doesn’t rotate properly to open right). – OBJ: Imports without (complete) materials or textures. It does have a UV map still. Again, parenting is lost, and the origin of the door is also again put at the base of the stand (so it doesn’t rotate properly to open right). – FBX: Imports without (complete) materials or textures. Contains a UV map. Keeps parenting.