Why didn't Bin Laden's compound have census markers on the front gate?

4. Missing census markers

Mysteriously, census takers apparently avoided Osama bin Laden’s compound. Painted on the entrance gate to most homes in the neighborhood – but not at Osama bin Laden’s compound – was a note in Urdu saying that census enumerators had visited over the past two months. Houses that participate in the census have to give details about everyone who lives there.