They might. Sending stuff besides letters is generally a bad idea, because it can, and likely will, be opened in front of everyone, and get fussed over. When Nekofrog was in bootcamp, I only sent letters, and when he finally asked for me to send photos, I made sure that he was sure that it was okay for him to receive pictures with his letters. If in doubt, don't do it. It might cause some teasing, or get tossed in the trash.