Ordinary PO boxes are pretty burglar proof Digi.   It would take more than a petty criminal deciding to take his chances.

And you are right about them being silly yo enter the PO with stolen cards to pick up other parcels.   We are so well known at our PO that the parcels are already on the counter by the time we get to the head of the line and they never even look at ID.  But I guess not everyone has been at the same address for over 40 years....we should be well known.