No need for "fake-" now, since racket resolves at the file level.

collects/handin-server/overridden-collects/readme.txt

@@ -4,11 +4,3 @@ that appear here will be used instead of ones in the Racket tree or the
 user-local collections.  Use it to override collections that are safe
 for testing, for example -- avoid using real GUI.  See also the
 documentation for `sandbox-override-collection-paths' in "doc.txt".
-
-This is currently used with the `teachpack' collection.  Note that
-Racket resolves collection directories based on toplevel names only,
-which means that if we actually use `teachpack' for the directory
-name, then files that are not here will not be searched in the usual
-plt tree.  Because of this the collection is called `fake-teachpack',
-and checkers should specify requires in this collection if submissions
-need a fake teachpack.