Letterbox art in Killarney Heights

I go for a 3km walk each morning and have noticed that there's lots of interesting letterboxes in this suburb. Here's a few.

Is this not art?

Homeowners stay 12.2 years in Killarney Heights

The Manly Daily reports that Aside from Elanora Heights and North Manly, the longest average number of years that homeowners stay is at Killarney Heights at an average of 12.2 years.