I would wrap the fudge in fairly large squares or blocks using cling film. Then place the blocks into a plastic shoe box or similar inexpensive container from the dollar store. Pack any loose corners in the container with crumpled wax paper, to insure a tight fit. Tape the container shut using clear movers/mailing tape, put it into a padded mailer, similar to those used for mailing books and toss it in the mail. Your son and his buddies can unwrap a block/candy bar as they need it and the others should stay fresh for several days in the refrigerator
If you want me to test this for you I will PM my address to you and we can start with some chocolate fudge or some brownies! I promise to work with you until we perfect the entire process!