Meshes of these bots contain references to those files:
textures\creatures\SentryBot_Outcast.dds
textures\creatures\SentryBot_Outcast_n.dds
textures\creatures\SentryBot_BoS_g.dds
Thing is, neither Fallout - Textures.bsa or Fallout - Textures2.bsa contain any of those. As a result... well, all of us know how untextured model looks in game.
Could anyone confirm this?