The far away file cabinet
As with the previous poster, I have a separate, not as easy to get to file cabinet in which I've been putting those files. In my case though it is due to space. The cabinet next to my desk is quite full and the one on the other side of the room is quite empty. I don't think I'd bother moving them if I didn't have a space issue.
I also save the label titles in a word document (when I type them to print the label) so I can search that document to find if I've already made a file (this is great for those items that could be filed under multiple headings). I mark (DS) for "deep storage" on those files I move to the other cabinet.