I would never make the assumption of anything just for convenience sakes, admittedly having a very successful PO box not in your name would be hard to let go of and if a no show happened I would like you most probably be tempted to push it after a break of a month or two and try again. A lot however would depend on the size of the order that didn't make it if I were making calculated judgements on whether to burn or risk using again. Don't make the mistake of assuming LE will not attempt a CD at a PO box, I have heard of one unlucky person in my country currently facing serious charges in part evidenced by CCTV from post offices, you can never be too careful. Stay safe people.