This is a single crate from one of the Maxis neighbourhood objects (Wooden Crates, available for Build/Buy in Liberated Garden Stuff) made to work as an end table and also stackable for deco purposes.
Find it in Surfaces > End Tables for 50§. One colour option as shown. It is available as a packing crate too, see here (scumbumbo).
Polygon Count: 32V/12F, sun shadow: 8V/12F