Delivery only postboxs don't have **public**  reference numbers.

It's seen on the right here (looking slightly wonky): https://www.mapillary.com/app/?focus=photo&lat=53.29220319999996&lng=-6.245952200000033&z=19.69030299353181&dateFrom=2018-01-01&pKey=309694964019085 on the right.

This area may have been redeveloped.