404's for Network theme files

I was looking through web stat logs and saw 404's on these theme files:

/wp-content/themes/network/library/images/replyto_arrow.gif
/wp-content/themes/network/library/scripts/cross.gif
/wp-content/themes/network/library/scripts/arrow.gif

I haven't changed any theme files, and I have the most up-to-date version.

Please review.

Thank you.