My sister-in-law found a lost Labrador in Serangoon Gardens recently. The dog did not know where to go, so she took the dog in. A check with the SPCA and AVA revealed a sad fate for the dog should no one claim it.
On a hunch she asked the postman if he knew .. lo and behold he did recognise the dog and led the dog home to its happy master.
Moral of the story Postmen can help, especially for dogs. Not so for hamsters.