Bootup_Graphics.packis a SARC archives which are found in Content/Pack. It is similar to the normal Bootup.pack, but contain contains shaders and other miscellaneous files related to the graphics system.
Model contains sbfres graphic resource files, which contain models, textures and animations. Sometimes a texture or animation file will be in the unpacked content files, but its corresponding model will be inside an archive.
The Shader directory contains game shader files.