I am quite surprised at the amount of mail that comes to our block addressed just to the street address with no unit number included. Sometimes it goes into the Strata mailbox, sometimes a “lottery” to see which resident’s letter box gets it, sometimes just left in the “overflow” open slot.
There is also the mail which has been incorrectly addressed (usually previous residents) or incorrectly delivered (a different street number, same unit/street number in a different street, same street number/name in a different suburb. This invariably gets left in an open location on top of the boxes or in the adjacent gardens; do people believe that the postie will pick it up and take it away next time he comes around? And a fair bit of this mail just ends up in the garbage bins.
There is a lot of “secure” mail in both these categories, no wonder it gets misused.