[gentoo-user] Trouble fetching all required files for network-less machine

I'm trying to fetch all possible files including those that might
satisfy dependencies and USE flags for every package on my system. The
reason I'm doing this is because I have a network-less machine that I
wish to transfer these files to so that I may have the same environment
on both machines. But every so often a package fails to install because
of failure to fetch dependencies. On my networked machine I run emerge
-efD world and emerge -fD system it fetches files and completes without
errors. I then take a copy of the distfiles dir to the networkless
machine and run emerge k3b, for example, and it fails because it was
unable to fetch some dependent file. This after I ran the same command
on my networked machine and moving distfiles to my networkless box. Both
profiles on the two machines are identical and they use the same USE
flags. How can I make sure that every possible or contingent file is
fetch? For example...I might not use the mp3 USE flag or any other use
flag for a program but I would like it to satisfy all possible FLAGS
when fetching...How can I go about doing that? 
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