I just assumed he mastrubated into the box, to show her what she was missing, but that would be a bad idea since you would be handing over proof of who did the deed. As if there wasn't enough proof from the surveillance tapes, coffee sales receipts, and eye witnesses. I once decided to never mastrubate again, which caused me to have my first wet dream which I thought was much worse. I was in college at the time and shared a single dorm room with another guy. Till this day I never knew if he heard it or not. I went back to periodic mastrubation and never had another wet dream.