Materials are used only in 3Ds Max 2009 and FBX files. The OBJ version has no materials, but the OBJ archive contains all the textures
The Painted Box is composed of 2 different painted wood materials: antique painted wood and new painted wood.
For ease of use, these materials are contained in separate archives, that's why there are 2 archives for 3Ds Max 2009 format, 2 archives for fbx format and one for obj format. These two materials are shown in the pictures. All the textures of the two materials are created with Unwrap. The light rig/HDRI is not included.
On browsing my other models, you'll find many of this kind. There is a large diversity of the chests with various paintings