40ft Shipping Container Side Open (Subdivision ready 3D model) is available on CGTrader for $29. Original author: dragosburian. Specs: 356918 polys, 370200 verts.
BLEND (Blender, filesize: 33.2 MB), BLEND (Blender, filesize: 33.2 MB), OBJ (OBJ, filesize: 23.8 MB), FBX (Autodesk FBX, filesize: 16.2 MB), DAE (Collada, filesize: 14.4 MB), STL (Stereolithography, filesize: 16.7 MB)