"We burglarized a house, officer, and stole these CD-ROMs of all unlikely things and we took them straight home and looked at them and found that kiddie porn you told us to find... Er, I mean, we found kiddy porn on them so we did the Christian thing and turned ourselves in so you policemen could catch that bad man! So now you're going to look the other way on that illegal chop-shop we were running out of that phony auto repair business where we had all those stolen cars, right?"
Right.
The ATF does stuff like this all the time, as you might have heard recently.
And the kids say they broke in specifically to steal 'empty' CD ROMS? What made them expect to find a huge stack of CDs in the first place? Sorta like stealing paper plates and leaving the sterling silverware alone.