I've been tossing things in a box to send to my son after Indoc like headphones, camera, clock radio/cd player. However, I don't really know what he's allowed to have and can't really communicate with him to find out what he'd like to have me send from home. Can they have their MP3 player and/or their clock radio/cd player? Can we send their favorite music cds? Any advise would be greatly appreciated so I can get it in the mail.