Write-only access that can see the files present

In our schools, we have network shares for different classes containing "Hand In, Hand Out" folders. Students put their work in the Hand In folder, and teachers put assignments in the Hand Out folder.

The Hand In folder is one that the students have write-only access to. [Mac OS X calls such a folder a "Drop Box," as you can drag and drop files to it, but not see what is inside it.]

I looked into it, and concluded that the answer was no, but, does any combination of permissions and access control lists allow one to have a folder with write-only access in which you can see the names of the files that reside in it (but not actually open the files)? In an event where a student was unclear on whether they'd turned in an assignement, this would allow them to verify if they had or not.

One step better would be if students could see the filenames of files that they turned in, but not those of anyone else.

Update: One more real nuissance is that students may need to turn in entire folders, and not just single files. Mac OS X uses bundles — things that look like files to a user, but are actually directories. (Applications are the best example, but Pages, Keynote, and heck, even TextEdit (when you add a graphic to your document), save bundles.) It took some extra work to make it so they could hand in folders (as you can see below).

Here is part of my existing script. Note that this does what I want except for yield any sort of listing of the files inside:

$ADMIN is a system administrator user.
$STAFF is a group of teachers.
$GRADE is a group represting a grade of students.
The funky chmod command is what one does to set ACLs under OS X.

# Create the hand-in folder
mkdir "Hand In"
chown "$ADMIN:$GRADE" "Hand In"
chmod 4730 "Hand In"
chmod +a "$ADMIN allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown,file_inherit,directory_inherit" "Hand In"
chmod +a "$STAFF allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown,file_inherit,directory_inherit" "Hand In"
chmod +a "$GRADE allow add_file,delete,add_subdirectory,delete_child,writeattr,writeextattr,file_inherit,directory_inherit" "Hand In"

What this does then is gives the admin user and staff group full access to the files in the Hand In folder (so they can delete them, move them, etc), and it allows students to hand in files or folders (but not see them at all!).