The admins at the department will be able to run chown or chmod so that your friends account owns them. They'll just need to know which home directory the files are currently in. Actually, they can find them without you telling them, but they'll probably want to hear it from you as confirmation.
Using chown can make your friends account the owner so that his account has the '7' (rwx) permission on the files. Using chmod can change the permissions from 711 to 716, for example so that your friend can read and delete the files. The first way is preferable because the last number is the permission that everyone has on the file.
I open someone's post, go away to make a coffee and by the time I get back it's already replied to
