Non-public boxes emptied by Royal Mail would not have to carry a cypher. Royal Mail write-up boxes manufactured since 1994 carry the wording 'Royal Mail', Typically over the aperture (lamp boxes) or to the door (pillar boxes). Prior to this date all submit boxes, aside from the Anonymous pillar boxes, https://codyqyvqi.ezblogz.com/59642807/rumored-buzz-on-letter-boxes-australia