Blogs MU Theme references missing files and generates a 404 response in Apache log

I'm using Blogs MU Theme version 1.2.2 and I noticed 404 responses in my Apache log for the following references:

/wp-content/themes/blogs-mu/_inc/css/custom.css
/wp-content/themes/blogs-mu/_inc/images/navs.png
/wp-content/themes/blogs-mu/favicon.ico
/wp-content/themes/blogs-mu/_inc/css/none
/wp-content/themes/blogs-mu/_inc/images/nav-arrow.png

I can't find these files in the theme, so I am assuming they aren't used.

I was wondering if these references could be removed if they truly aren't there?

Thanks,

Scott