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Hello and thank you for using JustAnswer. I cannot tell you why he is specifically keeping this box with nude pictures of his past partners, as only he can tell you the exact reason he has not thrown out the box yet. But no matter what you should calmly explain to him how hurt you are that he has not thrown those pictures yet and that you would like him to do so immediately. Explain to him that you and he are in a committed relationship now and that he does need these pictures to delve into a fantasy of his previous partners. You can tell him that you feel insecure and second-best when he keeps these pictures around as it may make you feel you are not enough for him.
Please let me know if you have any other questions or concerns as I would be happy to continue assisting you regarding this issue.