While I agree that this guy is clearly a thief, I'd still disagree that there's no legitimate reason to modify a modem. I don't rent mine, I bought it, and it shouldn't be a crime to modify my own property. Maybe I'd like to change the firmware or remove the case to scavenge parts. Maybe I even want to change my MAC address. My old ISP made me re-enter my account info when I did that, and then it would work again. (Haven't tried it with the new one.) Nothing wrong with that.