Pages, Comic Life, and Drop Box concept

Hello, all. I run in this problem regarding Apple Drop Box and Pages & Comic Life programs.
Our students use the Drop Box to turnin their homeworks to the teachers by authenticate into the teachers’ drop boxes as Guest. The Drop Box has its default “write only” setting.
We run into this problem: the files are turned into “Nobody” for the owner as expected, the Group and Everyone keep theirs ownerships and permissions from the local file 🙄

The real problem happens when programs like Pages and Comic Life have their save files as a folder (index file, thumb file, and content file.) When the students drag these saved files to their teachers’ Drop Boxes, the documents turn to “Nobody” for the owner and retain the Group and Everyone from the local files. This, effectively, render the saved documents useless because no-one has the permission to open it (Nobody-R&W, Group: student-R, Everyone-R).

Have anyone run into this same problem? Solutions? How do you apply the ownership and permission settings of the Open Directory to Group and Everyone?