Postal sorting snafu

Compare these two addresses:

Number 1:

Miss Sarah Jones
Unit 26 14-18 Johnson Street
Campsie NSW 2194

Number 2:

Miss Britney Smith
Unit 26 18 Camptown Road
North Sydney NSW 2060

Now, if you were living with Miss Smith at North Sydney and received the letter addressed to Miss Jones, would you be surprised? Now there are similarities in the street numbering and the name of Miss Jones's suburb is remarkably similar to Miss Smith's street name, and of course they both have the same christian name (Miss), but standing at the letterbox at North Sydney and holding the letter addressed to Miss Jones, you could be forgiven for wondering about the intelligence or otherwise of the postal sorting system.

This is a true story, only the names and addresses have been changed to protect the innocent.