Duck Bin It Code?

The grass was long and the lawn looks so untidy. I thought it is time to give the lawn a trim. While mowing the lawn, something caught my eye on my neighbour’s nature strip.

Curious I walked over and have a look. This message is on the concrete storm water drain cover.

I guess my curious mind will run wild tonight. Is it a coded message to someone? Is my neighbour a spy? Ha, ha, ha. Sorry, cannot help it. Blame it on Dan Brown and his Da Vinci Code.